In the field of search engine optimization, link building describes actions aimed at increasing the number and quality of inbound links to a page.
A reciprocal link is a mutual link between two objects, commonly between two websites, to ensure mutual traffic. For example, Alice and Bob have websites. If Bob’s website links to Alice’s website, and Alice’s website links to Bob’s website, the websites are reciprocally linked. Website owners often submit their sites to reciprocal link exchange directories in order to achieve higher rankings in the search engines. Reciprocal linking between websites is no longer an important part of the search engine optimization process. Google and other search engines now do not give credit to reciprocal linking as it does not indicate genuine link popularity.
Leaving a comment on a blog can result in a relevant do-follow link to the individual’s website. Most of the time, however, leaving a comment on a blog turns into a no-follow link, which is almost useless in the eyes of search engines, such as Google and Yahoo! Search. On the other hand, most blog comments get clicked on by the readers of the blog if the comment is well-thought-out and pertains to the discussion of the other commenters and the post on the blog.
Directory link building
Website directories are lists of links to websites, which are sorted into categories. Website owners can submit their site to many of these directories. Some directories accept payment for listing in their directory, while others are free.
Social bookmarking is a way of saving and categorizing web pages in a public location, on the web. Because bookmarks have anchor text and are shared and stored publicly, they are scanned by search engine crawlers and have search engine optimization value.
In the context of the World Wide Web, deep linking consists of using hyperlink that links to a specific, generally searchable or indexed, piece of web content on a website (i.e. http://example.com/path/page), rather than the home page.