Internet forums are online platforms where people can discuss various topics by posting messages and replies. Users can create threads, which are conversations centered around a specific subject, allowing others to contribute their thoughts and opinions. These forums often cover a wide range of interests, from hobbies and technology to support groups and professional advice. Participants typically register for an account to post, but many forums allow guests to read discussions. Moderators help maintain order by enforcing rules and guidelines. Popular examples of internet forums include Reddit, Stack Overflow, and 4chan, each catering to different communities and interests.