What Is a Backlink?
Definition
A backlink (also called an inbound link or incoming link) is a hyperlink on one website that points to a page on another website. Search engines use backlinks as a key ranking signal: the more high-quality backlinks a page has, the more authoritative it appears.
Why backlinks matter
Backlinks are one of the top ranking factors in Google's algorithm. When a reputable site links to your content, it acts as a vote of confidence.
Not all backlinks are equal. A single link from a high-authority domain carries far more weight than dozens of links from low-quality directories.
Types of backlinks
Google recognizes several link attributes that tell search engines how to treat a link:
| Type | Passes SEO value? | Example |
|---|---|---|
| Dofollow | Yes | Editorial mention in a blog post |
| Nofollow | Not directly | Social media links, some blog comments |
| Sponsored | No | Paid placements marked with rel="sponsored" |
| UGC | No | Forum posts, user comments |
Note: security attributes like noopener and noreferrer are sometimes added to external links but have no effect on SEO value.
How to earn high-quality backlinks
The best backlinks are earned, not bought — though some marketers still buy backlinks despite the risks. Four proven methods:
- Create link-worthy content, original research, data studies, and detailed guides naturally attract links.
- Outreach, reach out to bloggers who write about your topic and offer genuine value.
- Guest posting, write articles for other blogs in your niche with a link back to your site.
- Broken link building, find dead links on other sites and suggest your content as a replacement.
For a full breakdown of strategies, see our guide: How to Build Backlinks in 2026.
Which type of backlink is most valuable for SEO?
Right. Editorial links from relevant, authoritative sites carry the most SEO weight because they signal genuine endorsement.
The most valuable backlinks are editorial mentions from relevant, authoritative sites. These signal real endorsement to search engines, unlike comment links or social profiles which typically don't pass SEO value.
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Start Getting Mentioned For $99/moHow many backlinks do you need?
There's no magic number. Quality and relevance matter more than quantity. Our guide on how many backlinks you need breaks this down by keyword difficulty and niche.
A handful of backlinks from niche-relevant sites with strong domain authority will outperform hundreds of irrelevant links. You can check any site's authority before pitching. Focus on building a diverse backlink profile over time. Consistency beats bursts.