A blog, or web log, is an online JOURNAL or diary that is regularly updated with new content. It is usually written by an individual or a group of people and can be used to share opinions, experiences, and news. The term 'blog' is derived from the combination of two words: 'LIVE' and 'JOURNAL'. The word 'LIVE' refers to the fact that the content is constantly being updated, while 'JOURNAL' refers to the fact that it is a personal record of thoughts and experiences.