What Is a Backlink? Definition
A backlink is a hyperlink on one website that points to another website. When a reputable site links to your page, it signals to search engines that your content is credible and valuable — acting as a vote of confidence that contributes to your domain authority and search rankings.
Backlinks remain one of Google's top three ranking factors, alongside content quality and RankBrain (user behavior signals). Building a strong backlink profile is a core component of off-page SEO strategy.
Types of Backlinks
Do-Follow vs. No-Follow
- Do-follow links — pass SEO authority (link equity) from the linking site to your site. These are the most valuable for rankings.
- No-follow links — include a rel='nofollow' attribute telling search engines not to pass authority. Less valuable for SEO but still contribute to brand visibility.
- Sponsored/UGC — specific rel attributes for paid links and user-generated content; Google treats these like no-follow.
By Quality
- Editorial backlinks — earned through genuinely valuable content; highest authority
- Guest post backlinks — placed within guest articles on relevant blogs
- Resource page backlinks — listed in curated link directories on authoritative sites
- Broken link replacements — replacing dead links on other sites with your relevant content
How Backlinks Affect SEO Rankings
Google's algorithm evaluates backlinks by quantity, quality, and relevance. A single backlink from a high-authority domain (DR 70+) in your industry can outweigh hundreds of links from low-authority, unrelated sites.
Key signals Google evaluates in a backlink: the domain authority of the linking site, the relevance of the linking page's topic to your page, the anchor text used, and whether the link is do-follow.
Building Backlinks: Ethical Approaches
- Create link-worthy content — data studies, original research, and comprehensive guides attract editorial links naturally
- Guest posting — contribute expert content to relevant industry publications
- Digital PR — get mentioned in press coverage, industry reports, and roundups
- Broken link building — identify dead links on authority sites and offer your content as a replacement
- Resource page outreach — get listed on curated resource pages in your industry
Sagara Ruang's SEO service includes backlink strategy and acquisition. See our SEO services.
Real Examples
Editorial backlink
A marketing publication writes about Instagram strategy trends and links to Sagara Ruang's engagement rate guide as a reference — an editorial backlink earned through content quality.
Guest post backlink
An SEO professional writes a guest article on a leading digital marketing blog and includes a contextual link to their agency's SEO case study.