# What Is a Backlink? Complete Definition & Guide Understand what backlinks are, why they matter for SEO, and how they influence search rankings. Complete guide to inbound link fundamentals. Canonical: https://backlinkgrid.com/glossary/backlink A **backlink** is a hyperlink on one website that points to a page on another website. When Site A links to Site B, Site B has received a backlink from Site A. Also called inbound links, incoming links, or external links (from the receiving site's perspective). ## Simple Definition Think of a backlink as a citation or reference. When someone links to your website, they're essentially saying "this page has something worth looking at." Search engines interpret backlinks as votes of confidence. **Example**: If a news article about gardening links to your plant care guide, you've earned a backlink from that news site. --- ## Why Backlinks Matter ### Search Engine Ranking Factor Backlinks have been a core ranking factor since Google's founding. The original PageRank algorithm was built on the idea that pages with more quality links deserve higher rankings. **How search engines use backlinks**: - Measure authority and trust - Understand topic relationships - Discover new content - Validate content quality ### Referral Traffic Beyond SEO, backlinks drive direct visitors. When someone clicks a link to your site, that's referral traffic—often high-quality since it comes with context. ### Discovery and Indexing Search engine crawlers follow links to discover new pages. Backlinks help ensure your content gets found and indexed. --- ## Backlink Anatomy Every backlink has key components: ### Source Page The page containing the link (where the link comes from). ### Target Page The page being linked to (where the link points). ### Anchor Text The clickable text of the link. Provides context about the target page. ### Link Attributes HTML attributes that modify link behaviour: - `rel="nofollow"` - Suggests not passing ranking value - `rel="sponsored"` - Marks paid links - `rel="ugc"` - Marks user-generated content ### Link Context The surrounding content and the linking page's topic affect how search engines interpret the link's relevance. --- ## Types of Backlinks ### By Link Attribute **Do-follow links**: Standard links that pass ranking signals. Most valuable for SEO. **No-follow links**: Links with rel="nofollow" attribute. Originally didn't pass value; Google now treats as a "hint." **Sponsored links**: Marked as paid/advertisement with rel="sponsored". **UGC links**: Links in user-generated content marked with rel="ugc". ### By Acquisition Method **Natural/Editorial links**: Given organically because someone found your content valuable. **Outreach links**: Earned through direct contact—guest posts, resource requests, etc. **Self-created links**: Placed by you in forums, comments, directories. Generally lowest value. ### By Placement **Contextual links**: Within body content, surrounded by relevant text. Most valuable. **Navigation links**: In menus or site navigation. **Footer links**: In page footers. Often site-wide. **Sidebar links**: In page sidebars or widgets. **Comment links**: In blog comments. Usually nofollow. --- ## What Makes a Good Backlink? ### Quality Indicators **Relevance**: Link comes from a topically related site or page. **Authority**: Linking site has strong domain authority and trust. **Placement**: Link is contextual, within main content. **Editorial**: Link was given naturally, not paid for or exchanged. **Traffic**: Linking site has real visitors, not just metrics. ### Warning Signs **Irrelevance**: Link from completely unrelated site. **Spam signals**: Linking site is low-quality or spammy. **Manipulation**: Link was clearly paid for or part of a scheme. **Over-optimised anchor text**: Exact-match anchor text at scale. --- ## Backlink vs Related Terms ### Backlink vs External Link Same link, different perspective: - **Backlink**: Viewed from the receiving site's perspective - **External link**: Viewed from the linking site's perspective ### Backlink vs Internal Link Different link types: - **Backlink**: From another domain to yours - **Internal link**: From one page on your domain to another ### Backlink vs Referring Domain Different metrics: - **Backlink**: An individual link - **Referring domain**: A unique domain that links to you (may have multiple backlinks) --- ## How to Get Backlinks ### Content-Driven Methods - Create comprehensive, valuable content - Publish original research with data - Build useful tools or resources - Develop visual content (infographics, charts) ### Outreach Methods - Guest posting on relevant sites - Resource page link building - Broken link replacement - Digital PR and media coverage ### Relationship Methods - Build industry connections - Participate in communities - Collaborate with complementary businesses [Full guide: How to Start Link Building →](/link-building/how-to-start) --- ## Measuring Backlinks ### Key Metrics **Total backlinks**: Raw count of all links pointing to your site. **Referring domains**: Unique domains linking to you (often more meaningful than total links). **Do-follow ratio**: Percentage of links passing ranking value. **Anchor text distribution**: Mix of anchor text types. **Domain authority of sources**: Quality level of linking sites. ### Tools for Analysis - Ahrefs - Semrush - Moz Link Explorer - Google Search Console (limited but free) - Majestic (explore [alternatives to Majestic](/comparisons/majestic-alternatives) if you need different features) On a budget? Check out our roundup of [free tools for checking backlinks](/blog/best-free-backlink-checkers) to get started without a paid subscription. --- ## Common Questions ### How many backlinks do I need? There's no universal number. Focus on quality over quantity. The "right" number depends on your competitive landscape—analyse competitors ranking for your target keywords. ### Do all backlinks help? No. Low-quality, spammy, or irrelevant backlinks can potentially harm your rankings. A few quality backlinks often beat many poor ones. ### How long until backlinks impact rankings? Varies significantly—days to months. New links need to be discovered and processed. Impact depends on the link's quality and your site's existing authority. ### Should I disavow bad backlinks? Only if you have clear evidence of spammy links and potential penalty risk. Most sites don't need to use disavow. --- ## Summary A backlink is a link from another website to yours. Backlinks: - Act as votes of confidence - Influence search rankings - Drive referral traffic - Help with content discovery Focus on earning quality backlinks from relevant, authoritative sources through valuable content and legitimate outreach. --- ## Free Tools - [Free Backlink Checker](/tools/free-backlink-checker) - Check any website's backlinks instantly - [Backlink Audit Checklist](/tools/backlink-analyzer) - Step-by-step audit guide ## Related Terms - [Referring Domain](/glossary/referring-domain) - [Link Equity](/glossary/link-equity) - [Anchor Text](/glossary/anchor-text) - [Do-Follow Links](/glossary/dofollow-link) - [No-Follow Links](/glossary/nofollow-link)