A link farm refers to a set of web pages that are set up with the sole purpose of increasing traffic towards a particular website (which is the target page).  A link farm can be a single page having hyperlinks to the target site, or it can be multiple pages that have many links. This is a method of search engine optimisation as a site’s popularity increases when other sites add its link to theirs. Link farms are generally frowned upon and are often removed by the search engines.