An online forum is a place where people meet online to share information. In the forum, a user can create a post where other users can access it at any time. The dialogue created when users participate in responding to posts is called a thread. Users can start a new thread of a conversation by creating different topics. Online forums can require a user to be anonymous, or they can require registration. Most registrations are free, and an email address is the only requirement you need to be a user in most forums.