A driver is a person who controls and steers a vehicle, like a car, truck, or bus. When someone drives, they operate the steering wheel, pedals, and other controls to make the vehicle go where they want it to go. People can be drivers for their personal needs, or commercial drivers who work for businesses and make their living by driving trucks, buses, cars, forklifts, or other vehicles.

The word also means someone or something that causes or powers something else. In this sense, a driver makes things happen. Curiosity might be the driver behind a student's love of reading. Hard work could be the driver of an athlete's success. Scientists might say that changing ocean temperatures are a key driver of weather patterns.

In computers, a driver is a special program that helps the computer communicate with equipment like printers or keyboards. Without the right driver installed, your printer might not work even though it's plugged in.

In golf, a driver is the club used to hit the ball the farthest distance from the tee.