A governor leads a state government, just like a president leads a national government.
If you know that governing means to be in charge of something, that should help you remember what a governor is. Just as mayors run cities and presidents and prime ministers run countries, governors run states. A governor is elected for a term, has a vice governor, and deals with a legislature, just like the U.S. President. Governor is a very important title in the U.S., and many governors — such as Bill Clinton and George H.W. Bush — have gone on to become U.S. presidents.