This document discusses different types of chatting on the internet. It describes instant messaging as one of the most popular forms of chat, which allows two people to communicate through typed messages. Another form is ICQ, which assigns users a unique number for communication and file sharing. The final type discussed is IRC (Internet Relay Chat), which facilitates group communication through discussion channels and private one-on-one chats. Features like emoticons, sound effects, and color themes are also described.