"Chat" refers to the process of synchronous communications between individuals (normally).

The communication normally takes the form of text, as opposed to video or audio. However it should be noted that video and audio synchronous communications often provide text-based synchronous communications.

Chat may also be referred to as instant messaging.

Chat may take place between two individuals and between groups of individuals (the term chat room may be used to describe this). In addition it is possible to use chat with automated software.