It tells you how other websites are linking to yours. Website popularity is becoming equally important, as many search engines are using this information for ranking criterion. The more popular your site is, the better it is ranked on the search engines. There are three types of Links we generally used.
A reciprocal link is a mutual link between two objects, commonly between two websites to ensure mutual traffic. In order to take advantage of the need for inbound links to rank well in the search engines, a number of automatic link exchange services have been launched. It is only possible through mutual understanding. Link exchange forum, in which members will advertise the sites that they want to get links to, and will in turn offer reciprocal or three way links back to the sites that link to them. The links generated through such services are subject to editorial review.