An online forum is a digital platform where people can discuss various topics by posting messages and replies. Users can create threads to start conversations, ask questions, or share information. These forums often focus on specific interests, such as technology, health, or hobbies, allowing members to connect with others who share similar passions. Participants in online forums can remain anonymous or create profiles to interact with others. Many forums have rules to ensure respectful communication and maintain a positive environment. Popular examples of online forums include Reddit and Stack Exchange, where users can seek advice or share experiences.