A blog (short for Web log) is a type of Web site that is something like an online opinion column or diary.  It is usually maintained by an individual, with the newest entries on top of a long Web page, and typically has some kind of theme or topic.  Content often includes text written by the site author, or blogger, as well as images and links to other blogs, Web pages, and media related to its topic.  

What is great about blogs is they are also a place for a conversation.  In most cases you can add your comment to the blog and so can anyone else.  This lets bloggers create communities of people who are interested in the same subject, and the blog becomes a place where they can exchange information and viewpoints.

Anyone can have a blog or even many blogs.  People who write for newspapers and magazines, broadcasters, celebrities, business people, educators and many others find blogging a good way to get their thoughts out to a broad group of readers.  

Many companies provide services that make it easy for you to set up a blog, including blog.com , Google’s Blogger , WordPress.com , and Yahoo! 360°  . There are usually options that let you control who can see your blog.  Be careful with anything you want to keep private as anyone in the world could see what you post to your blog!