Anchor text in a link pointing to a page is often used by search engines to determine what a page being linked to is about, and to determine what words and phrases that page is relevant for.
But, there are a number of issues raised when anchor text is used by search engines in that way. Here are a few of them:
- If a page points two links to the same destination page using the same anchor text in both links (for example, in the navigation and the footer of the page), should the relevancy of that link text be weighted twice as much as if there were only a single link from the source page?
- If there is a link on every page of a site to a single page of that site (a site wide link) using the same anchor text, should each of those links accumulate in weight to determine how relevant that page might be for the text used in those links?
- If there are multiple links on a page to another page, or sitewide links to that other page, and the anchor text is different in each link, should the text in both links carry the same amount of weight in determining what the page being linked to is about?