A web forum (sometimes also called an Internet forum, but often just a forum) is a facility on the World Wide Web for holding discussions. Usually, each forum is organized in topics (topic categories) and threads. A thread is a posting with all its follow-ups; threads can be linear or have a tree structure. Unlike a mailing list or web group, the postings in a forum are not sent via e-mail. Unlike a chatroom, the discussions in a forum do not take place in real-time.
The proper latin plural of forum is "fora", but "forums" is also common in modern english.
Forums may require membership/registration (which can be free or not), or can allow anyone to participate without membership.
Spanking web forums
See spanking web forums and groups for a list of Web forums with a spanking topic.