A blog is a piece of written material on a web site that is maintained by a person or company, that helps provide information, opinions, news, graphics, videos, and more to readers. Blogs are normally maintained on a regular basis, and are normally the back bone of any web site.

Blogs help web sites get a higher rating with the search engines by providing a constant fresh content to the web. Blogs can be in the form or personal diaries, articles, news, or any other fresh information that is not copied from anywhere else online.