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 experiences. This format encourages community interaction and the sharing of information. Typically, forums are organized into categories and subcategories, making it easier for users to find discussions that interest them. Many forums also have rules and guidelines to ensure respectful communication. Popular examples of forums include Reddit and Stack Exchange, where users can engage in discussions ranging from hobbies to technical support.