Anchor Text

An anchor text is the clickable text of a link. Anchor texts are important for SEO, because the text signals meaning of the page that it links to. You don't always have control over the anchor text of links on external websites.

If you're link building for a blog about healthy food, and that's the keyword you're optimizing for, having an inbound link with anchor text 'healthy food' is more valuable than an anchor text such as 'click here'.