A route is a connection between a pair of terminals. The source and destination terminals make a terminal pair. Any time the source or destination terminal of a signal is specified, a route is created. Usually, you specify only one terminal for the route. For example, if you export a signal to the I/O connector, you set the destination terminal, but the source terminal is predetermined by the name of the signal. If you import a hardware trigger for a task, you can set the source terminal, but the destination terminal is predetermined by the name of the trigger.