What are Backlinks and How Do They Work?

If you have spent even a few hours inside SEO, you have heard the word “backlink” tossed around like it is the secret sauce of Google rankings. And honestly, it kind of is.

In 2026, when Google’s AI Overviews, ChatGPT, Perplexity and Gemini are rewriting how people find information, one question keeps coming up from business owners we work with at Thanksweb: “Do backlinks still matter?”

Short answer: yes, and more than ever. A recent industry survey found that 73.2% of SEO professionals believe backlinks significantly influence whether a brand appears inside Google’s AI Overviews. Backlinks are no longer just a traditional SEO signal, they are now one of the ways AI engines decide who is trustworthy enough to cite.

This guide is everything we wish someone had handed us when we first started building links in 2016. It covers what backlinks are, the types that actually move rankings, how to build them the right way, how to audit your competitors, how to clean up toxic links, and what changes in the AI search era.

Let us get into it.

What Is a Backlink?

A backlink is a hyperlink from one website to another. When Website A places a clickable link that points to Website B, Website B has earned a backlink.

Search engines treat each backlink as a vote of confidence. The logic is simple: if other reputable sites are pointing readers to your page, your page is probably worth reading.

Quick Example

Imagine you run a dental clinic in Mumbai. A popular health magazine writes an article titled “Top 10 Cosmetic Dentistry Procedures in 2026” and inside that article, the writer links to your service page with the anchor text “modern veneer treatment in Mumbai.”

That one sentence containing the clickable link is a backlink to your clinic. Google sees it, evaluates the health magazine’s authority, notices the topical relevance, and passes a small amount of ranking value (“link equity”) to your page.

Multiply that across dozens of relevant, credible sources and you have an authority profile Google is forced to take seriously.

Other Names You May Hear

• Inbound links
• Incoming links
• External links (from the pointing site’s perspective)
• One-way links

All refer to the same thing.

Why Backlinks Matter in 2026?

We are not going to ask you to take this on faith. Here is what the actual 2026 data says about backlinks.

Statistic	What It Means	Source
#1 ranking pages have 3.8x more backlinks than pages in positions 2–10	The gap between winning and losing is largely a link gap	Backlinko study of 11.8M SERPs
66.31% of all pages have zero backlinks	Most of the internet is invisible. A handful of quality links already puts you ahead	Ahrefs Content Explorer
94% of all content earns zero external links	If you are not actively building, you are statistically unseen	Ahrefs
73.2% of SEOs say backlinks impact AI Overview inclusion	Backlinks now influence both classic SEO and AI search visibility	Editorial.link 2026 Survey
Average cost of one quality backlink: $508.95	Links are a real asset, priced accordingly	Editorial.link 2026 (518 experts surveyed)
3.1 months average lag between earning a link and ranking impact	Be patient. Links compound	DemandSage / Moz 2026
58.1% of SEOs rank backlinks as their highest-impact ranking factor	Still the top off-page signal	Authority Hacker
Long-form content (2,000+ words) earns 77% more backlinks than short posts	Depth attracts links	Backlinko Content Study

Backlinks are the closest thing SEO has to compounding interest. A link earned this month is still passing authority two years from now. Every client we have taken from page 3 to page 1 at Thanksweb has had links as part of the story, never just content alone.

How Do Backlinks Actually Work?

Google’s original algorithm, PageRank, was built on a single insight: the web is a giant citation network. If scholars cite a paper, that paper matters. If websites link to a page, that page matters.

When a crawler lands on Website A and sees a link pointing to your site, four things happen:

1. Discovery — Google finds your page through the link (this is how new sites often get indexed in the first place).
2. Authority transfer — A portion of Website A’s PageRank flows to the linked page. The higher the authority of A, the more value transfers.
3. Relevance mapping — Google reads the surrounding text and anchor text to understand what your page is about.
4. Trust signals — Multiple links from different trustworthy domains raise your site’s perceived trustworthiness, which feeds into E-E-A-T evaluations.

This is why 50 links from 50 different relevant domains beat 500 links from one spammy forum every single time.

Types of Backlinks in SEO (And Which Ones Actually Work)

Not every link is equal. Here are the categories every business owner should understand.

1. Dofollow vs Nofollow

Dofollow backlinks pass ranking authority (link equity). By default, most links on the web are dofollow.

Nofollow backlinks include a rel=”nofollow” attribute telling Google not to pass authority. Common on social media, forums, and paid placements.

Do nofollow links still help? Yes. Since 2019, Google treats nofollow as a “hint” rather than a strict command. They help with traffic, brand exposure, and link diversity.

2. Editorial Backlinks

A writer mentions you naturally inside their article because your content is worth referencing. This is the gold standard. Google loves these because they are earned, not built.

3. Guest Post Backlinks

You write a guest article for another blog; they include a link back to your site in the byline or content. Still effective in 2026 when done with genuinely relevant, high-quality sites. 64.9% of SEOs still use guest posting according to Authority Hacker’s 2026 survey.

4. Contextual Backlinks

A link placed inside the body content of an article (not in a sidebar, footer, or author box). These carry significantly more weight because Google can see the surrounding topical context.

5. .EDU and .GOV Backlinks

Links from educational institutions (.edu) and government websites (.gov) are trusted because these domains are hard to earn links from and rarely spammy. A single relevant .edu mention can outweigh dozens of generic backlinks.

6. Profile Backlinks

Links from your business profile on platforms like LinkedIn, Crunchbase, Clutch, GMB, or industry directories. Most are nofollow, but they still help with brand signals and citations.

7. Forum and Community Backlinks

Answering questions on Reddit, Quora, Stack Overflow, or niche forums. Typically nofollow, but can drive real traffic and build topical authority.

8. Image Backlinks

When someone uses your infographic or original image and credits you with a link. Underrated tactic.

9. PBN (Private Blog Network) Backlinks

A network of sites built purely to pass authority. Avoid these. Google has cracked down hard on PBNs since 2018, and detection is aggressive in 2026 thanks to AI-based spam classifiers.

10. Paid / Purchased Backlinks

Against Google’s guidelines. The risk of a manual penalty is too high for the short-term lift. We have audited accounts recovering from penalties that took 8–12 months to claw back rankings.

What Makes a High-Quality Backlink?

Ask any SEO veteran and you will get roughly the same checklist. Here is ours, refined across 9 years of client work at Thanksweb.

A quality backlink has most or all of these attributes:

1. Topical relevance — the linking site covers your niche or a closely related one.
2. Domain authority — DR/DA of the linking domain is high (Ahrefs DR 30+ is a reasonable baseline).
3. Trust flow — Majestic Trust Flow signals the site is trusted by other trusted sites.
4. Contextual placement — the link sits inside the main body of a paragraph, not in a footer or comment.
5. Natural anchor text — reads like human writing, not over-optimised with exact match keywords.
6. Dofollow — passes authority (though a mix of dofollow/nofollow looks natural).
7. Unique referring domain — a new domain linking to you is more valuable than the 5th link from a domain that already links to you.
8. Organic traffic on the linking page — if the source page gets real traffic, the link is doubly valuable.
9. Indexed in Google — if Google has not indexed the linking page, the link passes no value.

A practical rule we give our clients: if a link would make sense to a human reader of that article, it is probably a good link. If it looks stuffed in, Google’s spam systems will think the same.

How to Get High-Quality Backlinks: 12 Proven Methods for 2026

These are ranked roughly by effort-to-reward ratio. Start from the top.

1. Digital PR

Rated the #1 most effective link-building tactic by 48.6% of SEO professionals in the 2026 Editorial.link survey. Digital PR means creating newsworthy assets — original surveys, data studies, opinion pieces, trend reports — and pitching them to journalists and publications. The backlinks are editorial, the domain authority is usually sky-high, and the brand lift is real.

Scalable tip: Run one original survey per quarter (even 200 respondents works). Package the findings into a press-ready page and pitch the top 20 journalists in your niche.

2. Guest Blogging (Done Right)

Forget mass-submitted articles on low-quality sites. Target 10 genuinely relevant blogs per quarter where your audience already reads. Pitch unique angles. Write genuinely useful content. One great guest post beats twenty mediocre ones.

3. HARO / Qwoted / Featured.com (Expert Quote Sourcing)

Journalists ask for expert quotes, you respond with a useful answer, you get quoted with a link. HARO shut down in 2024 but its replacements (Qwoted, Featured, Connectively) are active in 2026. Response rate of about 10–15% is normal for experts who pitch concise, specific answers fast.

4. Broken Link Building

Find broken outbound links on authority sites in your niche, email the site owner suggesting your content as a replacement. Tools like Ahrefs’ broken link checker or Check My Links (Chrome extension) speed this up. Low volume but high success rate because you are genuinely helping the site.

5. Skyscraper Technique

Find the top-performing content on a topic, create something objectively better (more depth, fresher data, better visuals), then reach out to everyone who linked to the original. Coined by Brian Dean in 2015 and still works when the “better” is actually better.

6. Linkable Assets / Original Research

Publish something nobody else has: an original survey, a calculator, an industry benchmark, a tool, a free template library. 12% of SEOs rank this as their most effective tactic in 2026. Ours at Thanksweb is the SEO Cost Calculator on our site — it attracts links precisely because no one else in our region publishes one.

7. Competitor Backlink Mining

Pull your top 3 competitors’ backlink profiles. Any site that links to them is philosophically open to linking to you. This is the single most repeatable link-building system we use for new clients.

8. Resource Page Link Building

Many sites maintain curated “best-of” resource pages (e.g., “Best SEO Blogs for Small Business”). Reach out with a short, specific pitch for inclusion. Works beautifully if you have a legitimate flagship asset to point to.

9. Unlinked Brand Mentions

Use Google Alerts, Mention.com, or Ahrefs’ Content Explorer to find articles that talk about your brand but did not link. Politely ask. Conversion rate is typically 30–40% because the relationship is already warm.

10. Podcast Guest Appearances

Every podcast episode ships with show notes on the host’s site, usually with links to guest sites. Bonus: the interview itself builds your brand authority (a separate E-E-A-T signal).

11. Original Images and Infographics

Create a useful infographic, post it on your blog, then either pitch it to relevant sites or find sites using similar (but inferior) visuals and offer yours as a replacement with credit.

12. Testimonial Links

Write genuine testimonials for tools and services your business uses. Many companies publish customer testimonials on their homepage or a dedicated page with a backlink to the reviewer’s site. Low effort, solid authority pages.

Bonus: Tactics to Avoid in 2026

• Buying links on Fiverr or link farms
• Commenting “great post!” with your URL on 500 blogs (spam signal)
• PBNs — detection is too good now
• Auto-generated directory submissions to 2,000 low-quality directories
• Forum signature link spam
• Exact-match anchor text over-optimisation (Penguin-era penalty still active)

If a tactic sounds like it scales infinitely with no effort, Google has already solved for it.

How to Check Backlinks to Your Website (Free and Paid Tools)

You cannot improve what you do not measure. Here are the tools our team actually uses day to day.

Free Options

Tool	What It Does Well	Limit
Google Search Console → Links report	Shows the links Google itself has indexed to your site. The most authoritative source	Data sampling; no third-party metrics
Ahrefs Webmaster Tools (free for verified sites)	Strong backlink data for your own domain	Your site only
Ubersuggest (Neil Patel)	Decent free daily quota for competitor backlink checks	Limited depth
SEOptimer / SEO Review Tools	Quick backlink snapshots	Small database
Semrush (free trial / limited free tier)	Solid free-tier data	Query-capped

Paid Options (for Serious Operators)

• Ahrefs — the gold standard for backlink data, largest index in the industry
• Semrush — best all-round suite if you also run PPC and keyword research
• Majestic — originator of Trust Flow / Citation Flow metrics, still strong for link quality evaluation
• Moz Pro — DA/PA metrics that many outreach templates still reference

Our take: If you run one client site, the free tools plus GSC are enough to see what you need to see. If you run multiple sites or an agency, paid tools pay for themselves within a month.

How to Check Your Backlinks Using Google Search Console

1. Log in to Google Search Console.
2. Select your property.
3. In the left menu, click Links.
4. Under External links, you will see the top linking sites and top linked pages.
5. Click More → Export to download the full list.

This is the only free data source that reflects what Google itself knows about your backlink profile.

How to Check Your Competitor’s Backlinks (Free and Paid)

This is one of the highest-ROI activities in SEO. Their best-performing links are your highest-probability prospects.

Step-by-step process:

1. Identify 3–5 direct competitors who outrank you for your money keywords.
2. Plug each domain into Ahrefs / Semrush / Ubersuggest and pull their top 100–200 backlinks sorted by domain authority.
3. Filter for dofollow, contextual, niche-relevant links only.
4. Export and dedupe — build a master prospect list in Google Sheets.
5. Figure out the link “type” for each: guest post, listicle inclusion, resource page, interview, etc.
6. Reverse engineer the pitch — whatever worked for your competitor should work for you, with adjustments.
7. Prioritise by effort-to-value — start with resource pages and listicles (easiest) before digital PR placements (hardest).

A competitor backlink audit usually reveals 40–80 realistic prospects in a single session. That is 3–6 months of link-building fuel in one afternoon.

Toxic Backlinks: How to Identify and Disavow Them

Not all backlinks help. Some actively hurt.

Signs of a Toxic Backlink

• Site is in a completely unrelated niche (casino site linking to a dental clinic)
• Obvious link farm or PBN footprint (same template across hundreds of sites)
• Foreign-language site unrelated to your audience
• Site is deindexed by Google
• Over-optimised exact-match anchor text
• Sudden spike of hundreds of links in 24 hours (negative SEO attack)
• Hidden links (white-on-white text, 1px font)

How to Audit for Toxic Links

• Run your domain through Ahrefs → look for referring domains with DR < 10 and spam indicators.
• Cross-check with Semrush’s Backlink Audit Tool which assigns each link a toxicity score.
• Review manually — tools flag false positives constantly.
• Build a list of confirmed toxic domains.

How to Disavow Backlinks Using Google Search Console

• Create a .txt file with one domain or URL per line in this format:

domain:spammy-site-example.com https://another-bad-site.com/specific-page

1. Go to the Google Disavow Tool.
2. Select your property.
3. Upload the .txt file.
4. Confirm.

Important: Use the disavow tool sparingly. Google’s spam systems already ignore most obviously bad links automatically. Only disavow when you have evidence of a manual action, an algorithmic ranking drop, or a negative SEO attack.

How Many Backlinks Do You Need to Rank?

The honest answer: it depends on your competitors.

A more useful answer: enough to match or exceed the referring domain count of the pages currently ranking on page one for your target keyword.

Quick Method

• Search your target keyword in an incognito window.
• Note the top 10 results.
• Run each through Ahrefs or Ubersuggest.
• Note the “Referring Domains” count for each.
• Calculate the median.

That is your target. If the median page on page one has 45 referring domains and you have 8, you know the gap.

What About “Backlinks Per Day — How Many Is Safe?”

There is no universal number. The real question is whether your velocity matches your site’s profile. A 6-month-old site suddenly gaining 300 backlinks a week looks unnatural. An established site gaining 50 links a week looks completely normal.

General guidance for small-to-mid businesses:

• Month 1–3: 5–15 quality links per month
• Month 4–6: 15–30 quality links per month
• Month 7+: Scale based on what is working

Quality always beats quantity. Ten editorial links in a quarter beats 500 forum signature links.

Backlinks in the AI Search Era (AEO, AI Overviews, and E-E-A-T)

The biggest shift in 2026 is that backlinks now influence two different ranking systems at once:

• Classical Google SERPs — same as always, PageRank-style authority transfer.
• AI-driven surfaces — Google AI Overviews, ChatGPT web browsing, Perplexity, Gemini, Claude, Bing AI — all of which rely partly on backlink signals to decide which sources to cite.

Why Backlinks Matter for AI Search

When an AI engine pulls an answer, it has to decide whose information to trust. Links from credible sources are one of the fastest proxies for credibility. A dental clinic cited by three mainstream health publications is far more likely to be mentioned inside an AI Overview answer about dental care than an identical clinic with zero editorial coverage.

The E-E-A-T Connection

Google’s E-E-A-T framework (Experience, Expertise, Authoritativeness, Trustworthiness) has authority baked into the middle of it — and authority is measured largely through external signals: who cites you, where, and in what context.

Three practical implications for 2026:

• Brand mentions matter even without links. AI systems pick up on co-citation. Being mentioned alongside established players raises your perceived authority.
• Topical clustering matters more. Links from sources that already talk about your exact niche carry more weight than generic high-DR sites. Read our content clusters guide for how to structure this on-site.
• Author authority transfers. Links attributed to named authors with visible expertise in the niche (a bio, a LinkedIn profile, other published work) carry more weight than anonymous site-level links.

If your backlink strategy in 2026 ignores AI visibility, you are optimising for half the internet.

Frequently Asked Questions (FAQs)

Related Reads on Thanksweb

• Why SEO Matters for AI Search
• What Are Content Clusters and Why Your SEO Strategy Needs Them
• Internal Links for SEO: An Actionable Guide
• On-Page SEO: What It Is and How to Do It
• How to Optimize For AI Overviews