Blog: A blog is basically a journal that is available on the web (it can be private or public). 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. Postings on a blog are almost always arranged in chronological order with the most recent additions featured most prominantly. From the WSJ, Businessweek, Fortune and countless other publications