What Is Link Building?
Link building is the practice of acquiring hyperlinks from other websites that point back to your own, used as a signal of trust and authority by search engines.
Example
A company might publish an original research report, then reach out to journalists and bloggers covering that industry, earning links back to the report from news articles that reference its findings.
Why it matters
Backlinks remain one of the strongest ranking signals search engines use, acting as a vote of confidence from one site to another. Quality and relevance of the linking site matter far more than sheer volume of links acquired.