This document provides an overview of Twitter, including what it is, why people use it, how businesses can use it, terminology, and tools for Twitter. Twitter allows users to send and read short 140-character messages called tweets to friends or followers. The document discusses how businesses can use Twitter to raise awareness, offer customer service, promote events, and network, while avoiding coming across as sales-oriented robots. It provides examples of companies using Twitter well and defines common Twitter terminology. Finally, it lists and describes 10 tools that can help manage a Twitter account or integrate it with other social media platforms and messaging services.