Link building
Link building is the action performed by webmasters in order to increase the number and quality of inbound links to a page. Inbound links or backlinks are links that a web page recieves from another web page. The number of backlinks is a factor in determining the popularity of a page. The process of link building is achieved through several types of links: reciprocal links, resource links, forum signature links, blog comments, directory links, social bookmarks etc.
Link building is a process used by webmasters to raise the importance of a website.