Offline may refer to any of the following:
1. A term describing when a connection is broken or disconnected. When a device is offline, it cannot send or receive information through that device. For example, if your printer is turned off, it is considered offline and cannot print anything. A printer may also be offline if it's a network printer and cannot be found, or the data cable connecting the printer is not connected correctly.
Should I use "offline," "off-line," or "off line" in my writing?
2. Offline or an offline game is a game play where the player doesn't connect to another computer or server and is only playing with NPCs (non-playing characters). If the game connects to the Internet or another computer and you play with your friends or other people it's considered an online game.