Definition of exception

An instruction that tells Windows Firewall to open a port briefly, allow a program or service to pass a specific piece of information through, and then close the port. These instructions are called exceptions’ because normally the firewall blocks all unsolicited attempts to send information.’

Computer Science

Other definitions of exception

An abnormal condition or error that occurs during the execution of a program. An exception requires the execution of software outside the normal flow of control.

Computer Science