Internet Relay Chat (IRC) and other online chat technologies allow users to join and communicate with many people at once, publicly. Users may join a pre-existing chat room or create a new one about any topic. Once inside, you may type messages that everyone else in the room can read, as well as respond tofrom others. Often there is a steady stream of people entering and leaving. Whether you are in another person's chat room or one you've created yourself, you are generally free to invite others online to join you in that room. Instant messaging facilitates both and interaction.