Originally called "Web Log" or binary-log, this is means of knowledge sharing on the web. It is a website where the owner (author) publishes personal messages, similar to a daily diary, and other people may reflect upon the entries, or make comments on the messages. Users can post a chronological, up-to-date e-journal entry of their thoughts. This is generally an open forum communication tool but it can perform a crucial function for an organization or company. There are three basic varieties: those that post links to other sources, those that compile news and articles, and those that provide a forum for opinions and commentary.