A blog is short term of web log. Basically it is a website or part of it which has entries kept in reverse chronological order. The purpose of it was to be an online journal or diary that was kept updated daily by an individual or many people. A blog can be personal thoughts or hierarchy of text, images. video or small events related to someone’s life.
The activity of updating blog on daily basis is called blogging. A person who is updating blog called blogger.
According to blogger.com: “A blog is a personal diary. A daily pulpit. A collaborative space. A political soapbox. A breaking-news outlet. A collection of links. Your own private thoughts. Memos to the world.”
As per Wikipedia: “A blog (a blend of the term web log) 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.”