A blog is a type of website or part of a website. Blogs are usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse-chronological order. Blog can also be used as a verb, meaning to maintain or add content to a blog.
A blog is a shortened version of "Web log".
The activity of updating a blog is “blogging” and someone who keeps a blog is a “blogger.”
