Idle may refer to any of the following:
1. A term used to describe when something is operating, but is not being used. For example, when your computer is on, but you are not doing anything with it, it is idle. Today, when a computer or electronics device is idle for too long, it may go into an energy-conserving mode or standby to save power.
3. When referring to chat, an idle user (idlers) refers to someone logged in to the chat, but hasn't been actively chatting for several minutes. Often these are users who are away from their keyboard, but want to view the conversations that took place while they were gone.