Message boards are online platforms where users can post messages, ask questions, and share information on various topics. They are organized into categories and threads, allowing users to follow discussions and contribute their thoughts. This format encourages community interaction and the exchange of ideas. Users can create accounts to participate in discussions, but many message boards also allow anonymous posting. Topics can range from hobbies and interests to technical support and news. Popular examples of message boards include Reddit and 4chan, which host diverse communities and discussions on countless subjects.