Look what I found on Google! It might help since it appears you were asleep during grammar school.
What are the rules for capitalization? It also helps to specify the year of your vehicle.
Assuming a 98, the ignition switch energizes the starter relay located in the underhood fusebox. The relay switches the high current battery power to the starter motor. If the relay shorts, it will continue to provide power to the motor. Likewise, the ignition switch may be shorting and keeping the relay energized. A wiring harness fault is also possible.
Steve