What Are Backlinks?
Backlinks (also called inbound links or incoming links) are hyperlinks from one website pointing to another. When Website A links to Website B, that's a backlink for Website B.
Search engines view backlinks as "votes of confidence." When a reputable website links to yours, it signals that your content is valuable, trustworthy, and worth referencing. This is why backlinks remain one of Google's most important ranking factors.
Think of it like academic citations: Just as a research paper gains credibility when cited by other respected papers, a website gains authority when linked to by other respected websites.
Why Backlinks Matter for SEO
Backlinks impact your search rankings in several ways:
1. Authority Signal
Search engines use backlinks to gauge a website's authority. The more high-quality sites linking to you, the more authoritative you appear for your topic.
2. Discovery and Crawling
Search engine crawlers follow links to discover new pages. Backlinks help ensure your content gets found and indexed faster.
3. Referral Traffic
Beyond SEO, backlinks drive direct referral traffic. A link from a popular website can send thousands of relevant visitors.
4. Trust and Credibility
Links from trusted sources (government sites, universities, established publications) pass more trust than links from unknown or low-quality sites.
Backlink Statistics:
- Pages with the most backlinks tend to rank highest in Google
- The #1 result in Google has an average of 3.8x more backlinks than positions #2-#10
- 66.31% of pages have zero backlinks (and thus struggle to rank)
Types of Backlinks
Not all backlinks are created equal. Understanding the different types helps you focus your link building efforts.
By Link Attribute
| Type | HTML Attribute | SEO Value |
|---|---|---|
| Dofollow | None (default) | Passes full link equity |
| Nofollow | rel="nofollow" | Limited/no direct SEO value |
| Sponsored | rel="sponsored" | Identifies paid links |
| UGC | rel="ugc" | User-generated content links |
Dofollow links are the most valuable for SEO as they pass "link equity" (ranking power) from the linking page to yours.
Nofollow links tell search engines not to follow or pass authority. While less valuable for rankings, they can still drive traffic and brand awareness.
By Source Quality
High-quality backlinks:
- Come from authoritative, relevant websites
- Are editorially placed (someone chose to link naturally)
- Use contextually relevant anchor text
- Are from unique referring domains
- Appear within main content (not footers or sidebars)
Low-quality backlinks:
- Come from spammy or irrelevant sites
- Are purchased or exchanged
- Come from link farms or private blog networks (PBNs)
- Have over-optimized or unnatural anchor text
- Appear in low-value locations (comment sections, forum signatures)
By Acquisition Method
| Method | Description | Risk Level |
|---|---|---|
| Earned | Naturally given without request | None |
| Built | Actively acquired through outreach | Low-Medium |
| Created | Self-placed (directories, profiles) | Medium |
| Bought | Purchased from link sellers | High (violates guidelines) |
What Makes a Good Backlink?
Evaluate potential backlinks using these criteria:
1. Relevance
Links from topically relevant sites carry more weight. A backlink from an SEO blog to your SEO tool matters more than a link from a cooking website.
2. Authority
The linking domain's authority matters. One link from the New York Times provides more value than 100 links from unknown blogs.
Check authority using:
- Domain Rating (Ahrefs)
- Domain Authority (Moz)
- Authority Score (Semrush)
3. Placement
Links within the main content area (contextual links) are more valuable than those in headers, footers, or sidebars.
4. Anchor Text
The clickable text of the link should be relevant but natural. Over-optimized anchor text (always using exact keywords) looks manipulative.
5. Traffic
Links from pages that receive actual traffic tend to pass more value than links from pages no one visits.
6. Uniqueness
One link from a new domain is often worth more than multiple links from a site that already links to you.
How to Build Backlinks (Ethical Methods)
1. Create Link-Worthy Content
The best way to earn backlinks is creating content people want to reference.
Linkable asset types:
- Original research and data studies
- Comprehensive guides and tutorials
- Free tools and calculators
- Industry surveys and reports
- Infographics and visual content
- Expert roundups and interviews
Example: Publishing original research like "We analyzed 10,000 websites to find the average page load time" naturally attracts links from people citing your data.
2. Guest Posting
Write articles for other websites in your industry in exchange for a link back to your site.
Best practices:
- Target relevant, authoritative publications
- Pitch unique, valuable topic ideas
- Write genuinely helpful content (not thinly-veiled ads)
- Use natural anchor text
- Limit to quality sites (avoid guest post farms)
3. Broken Link Building
Find broken links on other websites and suggest your content as a replacement.
Process:
- Find relevant websites in your niche
- Use tools like Ahrefs to find their broken outbound links
- If you have (or can create) content that matches the broken link's topic
- Reach out to the site owner offering your content as a replacement
4. Resource Page Link Building
Many websites maintain resource pages linking to helpful content in their industry.
Process:
- Search Google for "[your industry] resources" or "[your topic] useful links"
- Find relevant resource pages
- Ensure your content genuinely fits
- Reach out with a personalized pitch
5. Skyscraper Technique
Create content that's significantly better than existing top-ranking content, then reach out to sites linking to the inferior content.
Process:
- Find popular content in your niche with many backlinks
- Create something substantially better (more comprehensive, updated, better designed)
- Reach out to sites linking to the original, showing them your improved version
6. HARO (Help A Reporter Out)
Respond to journalist queries to earn links from major publications.
Process:
- Sign up for HARO or similar services (Qwoted, SourceBottle)
- Monitor relevant queries in your expertise area
- Provide genuinely helpful, quotable responses
- Earn links when journalists use your quotes
7. Digital PR
Create newsworthy content or campaigns that earn coverage from media outlets.
Approaches:
- Data-driven stories journalists can write about
- Controversial or surprising industry takes
- Newsjacking (relating your expertise to trending news)
- Community initiatives or charitable work
8. Reclaim Unlinked Mentions
Find brand mentions that don't include links and ask for them.
Process:
- Set up Google Alerts or use tools like Ahrefs to find brand mentions
- Identify mentions without links
- Reach out politely asking if they'd consider adding a link
Backlink Building Mistakes to Avoid
Buying Links
Purchasing links violates Google's guidelines and risks manual penalties. The short-term gain isn't worth the long-term risk.
Link Exchanges
"I'll link to you if you link to me" arrangements at scale appear manipulative. Natural relationships may result in mutual linking, but manufactured exchanges are problematic.
Private Blog Networks (PBNs)
Networks of sites created solely for linking purposes. Google has become adept at identifying and penalizing PBNs.
Over-Optimized Anchor Text
If 80% of your backlinks use the exact keyword you're targeting, it looks unnatural. Natural backlink profiles have diverse anchor text including branded terms, URLs, and generic phrases.
Irrelevant Links
Links from completely unrelated websites provide minimal value and may appear manipulative.
Low-Quality Directory Submissions
While some quality directories are fine, mass submission to low-quality directories is ineffective.
Analyzing Your Backlink Profile
Regularly audit your backlinks to understand your link profile and identify issues.
Key Metrics to Track
| Metric | What It Tells You |
|---|---|
| Total backlinks | Overall link quantity |
| Referring domains | Number of unique sites linking |
| Domain Rating/Authority | Overall site authority |
| New/lost links | Link velocity and trends |
| Anchor text distribution | Natural vs. manipulated |
| Follow vs. nofollow ratio | Link equity distribution |
Tools for Backlink Analysis
Free:
- Google Search Console (limited data on your own links)
- Bing Webmaster Tools
Paid:
- Ahrefs - Most comprehensive backlink database
- Semrush - Good backlink analysis plus other SEO tools
- Moz Link Explorer - Domain Authority originator
- Majestic - Trust Flow and Citation Flow metrics
Disavowing Toxic Links
If you have spammy backlinks (from link schemes, hacked sites, or negative SEO attacks), you can ask Google to ignore them using the Disavow Tool.
When to disavow:
- You've received a manual penalty for unnatural links
- You see clearly manipulative links you didn't build
- You've inherited bad links from a previous SEO campaign
Caution: Don't over-disavow. Only disavow clearly toxic links, since disavowing legitimate links can hurt your rankings.
Backlinks and GEO
As AI-powered search grows, backlinks remain important for different reasons:
- Authority signals - AI models may use link data to determine source credibility
- Content discovery - AI systems still need to find and index content
- Trust indicators - Well-linked sources may be preferred for AI citations
Building a strong backlink profile benefits both traditional SEO and emerging GEO strategies.
Backlink Building Timeline
Link building takes time. Realistic expectations:
- Month 1-2: Foundation work: create linkable assets, identify targets
- Month 3-4: Initial outreach, first links start appearing
- Month 5-6: Consistent link acquisition, refine what works
- Month 7-12: Compounding results, authority building
- Year 2+: Established authority, natural links increase
Frequently Asked Questions
How many backlinks do I need to rank?
There's no magic number. It depends on your competition. For low-competition keywords, you might rank with few or no backlinks. For competitive terms, you may need hundreds from quality sources.
Are backlinks still important in 2025?
Yes. While Google has become better at understanding content quality directly, backlinks remain a strong ranking signal. The key is focusing on quality over quantity.
Can I rank without backlinks?
Yes, for low-competition queries. However, for anything competitive, backlinks remain essential. Some sites rank well with excellent on-page SEO and brand authority, but most need backlinks.
Do nofollow links help SEO?
Directly, nofollow links don't pass ranking authority. However, they can drive referral traffic, increase brand awareness, and lead to natural dofollow links later. A healthy link profile includes both.
How do I know if a backlink is toxic?
Warning signs include: links from sites in unrelated languages, gambling/pharma sites (unless you're in those industries), sites with no content, obvious link farms, or sites penalized by Google.
Should I remove bad backlinks or disavow them?
Try removal first for links you control or can request removal. Use disavow for links you can't remove, especially those from hacked sites or obvious spam.
Related Terms
- Domain Authority - Website authority metric
- Anchor Text - Clickable text in a hyperlink
- Search Engine Optimization - The practice of optimizing for search
- Page Authority - Individual page authority metric
- Link Building - The practice of acquiring backlinks
Why this matters
Backlinks influences how search engines and users interpret your pages. When backlinks is handled consistently, it reduces ambiguity and improves performance over time.
Common mistakes
- Applying backlinks inconsistently across templates
- Ignoring how backlinks interacts with canonical or index rules
- Failing to validate backlinks after releases
- Over-optimizing backlinks without checking intent
- Leaving outdated backlinks rules in production
How to check or improve Backlinks (quick checklist)
- Review your current backlinks implementation on key templates.
- Validate backlinks using Search Console and a crawl.
- Document standards for backlinks to keep changes consistent.
- Monitor performance and update backlinks as intent shifts.
Examples
Example 1: A site standardizes backlinks and sees more stable indexing. Example 2: A team audits backlinks and resolves hidden conflicts.
FAQs
What is Backlinks?
Backlinks is a core concept that affects how pages are evaluated.
Why does Backlinks matter?
Because it shapes visibility, relevance, and user expectations.
How do I improve backlinks?
Use the checklist and verify changes across templates.
How often should I review backlinks?
After major releases and at least quarterly for critical pages.
Related resources
- Guide: /resources/guides/keyword-research-ai-search
- Template: /templates/definitive-guide
- Use case: /use-cases/marketing-agencies
- Glossary:
- /glossary/search-intent
- /glossary/serp