- Blog is short for weblog. A weblog is a journal (or newsletter) that is frequently updated and intended for general public consumption. Blogs generally represent the personality of the author or the Web site.
- A blog is basically a journal that is available on the web. The activity of updating a blog is "blogging" and someone who keeps a blog is a "blogger." Blogs are typically updated daily using software that allows people with little or no technical background to update and maintain the blog.
- a public web site where users post informal journals of their thoughts, comments, and philosophies, updated frequently and normally reflecting the views of the blog's creator.
So all in all it is a public journal of whatever you want it to be.