A link exchange Internet marketing campaign is the process of exchanging hyperlinks with a quality site that is somehow related to a company's product or service. For instance, a public relations agency may link to a search engine positioning firm's article on "PR and SEO marketing." The SEO may then include a link on their site listing the public relations company. Good link exchange vendors can increase a company's PageRank and increase the number of targeted visitors. Poor link exchanges (think $99 "link farms" where a company promises to link your site to thousands of others) can actually harm site positioning.

It is one of the legal way to promote your website...