Cancel may refer to any of the following:
1. Cancel is a button or option that allows you to stop or exit out of the program or dialog box that they are currently in and not save any of the changes made.
The Esc key can also be used to cancel the loading in programs. For example, if a web page is having a hard time loading you can press the Esc key to cancel the loading process.
2. Cancel is also a Linux command, see the cancel command page for further information about this command.