What are backlinks?

The answer

Backlinks are links from other websites to your pages. Links from relevant, trustworthy sources that you earned because your content is useful can help people discover your site. Manipulative practices are risky: Google's spam policies define buying or selling links that pass ranking credit as link spam, while paid links marked rel=nofollow or rel=sponsored are not a violation. Focus on pages worth citing, and be careful with services promising large numbers of links.