A link farm is a website (or a group of websites) created only for the purpose of increasing the link popularity of another site by increasing the number of incoming links. A link farm usually looks like a regular web page, but the majority of the content is hyperlinks -- often random and unrelated -- to other websites.
The process of exchanging reciprocal links with Web sites in order to increase search engine optimization.
search engine optimization (SEO) tactic in which a website enters a relationship of reciprocal linking with another site or pays a provider for a large number of inbound links.