Trillian is a multiprotocol instant messaging application designed to provide users with the ability to connect to various IM and social networking platforms from a single interface. It supports chat services like Facebook, Google Talk, XMPP, and others, allowing users to consolidate their messaging into one program. Trillian offers features like file transfers, group chats, emoticons, and chat history. It is available across multiple platforms, including Windows, macOS, iOS, Android, and through a web-based client.