The document provides an overview of instant messaging (IM), including what it is, popular IM services, how to get started using IM, features like buddy lists and emoticons, security concerns, and how the Birmingham Public Library uses IM for reference questions. Popular free IM services mentioned are Yahoo, MSN, and AOL, which allow live text-based chats between internet-connected computers. Setting up an IM account involves choosing a service, downloading software, creating a username and password, and adding contacts to your buddy list.