Definition:
A backlink is a link that a web page receives from another website. It is also called an inbound or external link and allows users and search engines to move from the source page to the linked page.
Backlinks can contribute to the discovery and evaluation of a page by search engines. Their value does not depend solely on quantity: topical relevance, context, the credibility of the source website, link placement and the editorial nature of the mention also matter.
A high-quality link usually appears because it provides a useful reference within the content. This does not mean that every link obtained through a collaboration is harmful, but its purpose and implementation should be transparent and appropriate.
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Backlinks in SEO
Links remain part of the systems search engines use to discover pages and understand their relationships. In SEO, a relevant backlink can provide context, support crawling and act as a signal concerning a page’s usefulness or reputation. However, no individual link guarantees better rankings.
An ordinary HTML link does not need a dofollow attribute. The term is used informally for a link that does not include instructions limiting how it should be interpreted. Other values can be used when a specific relationship exists:
rel="nofollow"indicates that the website does not want to endorse or directly associate itself with the linked page.rel="sponsored"identifies links related to advertising, sponsorships or another form of compensation.rel="ugc"identifies links within user-generated content, such as comments or forum posts.
Google treats these attributes as hints for its systems, not as a switch that simply passes or blocks a fixed amount of authority.
The expression link juice is used informally to describe the value or authority that links might pass. It is not an official metric and cannot be calculated as a precise and universal amount.
How to get backlinks
Acquiring relevant links usually requires useful content, editorial relationships and visibility within a sector. Common methods include:
- Digital media and publications: Original data, research, resources and expert contributions can be used as sources and receive editorial links. Payment for link placement should be properly disclosed.
- Directories: Specialist, moderated and relevant web directories can provide visibility. Mass submissions to directories with no practical value do not provide the same benefit.
- Profiles and communities: Professional profiles, forums and communities can support discovery and referral traffic. Their existence does not mean that they pass SEO authority.
- Collaborations with other websites: Interviews, joint projects, shared resources and references between organisations can generate relevant links. Systematic link exchanges intended solely to manipulate rankings may be treated as a link scheme.
Risks of unnatural links
Google’s spam policies classify links created primarily to manipulate search results as link spam. Examples include undisclosed buying or selling of links, excessive exchanges, automated link creation, mass submissions to low-quality directories and comments created solely to insert a URL.
Advertising or sponsored links are not prohibited, but they should be identified with rel="sponsored" or rel="nofollow". Links added by users can use rel="ugc" or rel="nofollow" where appropriate.
Google Penguin was developed to combat practices intended to manipulate search results through links. Panda was primarily associated with content quality and Hummingbird with understanding queries, so they should not be presented as backlink-specific penalties.
When manipulative link patterns are detected, Google may ignore or reduce the effect of particular links. It may also apply a manual action when its policies are violated. This does not make backlinks inherently harmful: relevant, editorially justified and properly labelled links remain part of how the web and SEO work.