forum

An Internet forum, or message board, is an online discussion platform where people can hold conversations in the form of posted messages. They differ from chat rooms in that messages are often longer than one line of text, and are at least temporarily archived. Also, depending on the access level of a user or the forum set-up, a posted message might need to be approved by a moderator before it becomes publicly visible. The name comes from the forums of Ancient Rome.
Forums have a specific set of jargon associated with them; for example, a single conversation is called a "thread" or "topic". A discussion forum is hierarchical or
tree-like in structure; a forum can contain a number of sub-forums, each of which may have several topics.
Depending on the forum's settings, users can be anonymous or have to register with the forum and then subsequently log in to post messages. On most forums, users do not have to log in to read existing messages.

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