Why do we need to use anchor text or the keyword in directory submission & blog commenting?

Question

Need help in Link building tips.

Answer 1

Anchor text helps tell the search engine what you are linking to.

Answer 2

Keywords in anchor text enhance the relevance of the target page pertaining to the keywords used. While the relevance of the page containing the anchor text is also enhanced to some degree (because of relevant keywords appearing on that page), the real gainer is the target page URL. Use this knowledge to build the relevance of each page of your site, through optimized anchor text containing important keywords, relevant to the theme of such pages, from other pages of your site.