What are three things that the camshaft can drive besides opening the valves?

In addition to opening the valves, the camshaft can drive the fuel pump, which delivers fuel to the engine, and the ignition system, which can include components like the distributor in older engines. It may also power the timing chain or belt, ensuring that the camshaft and crankshaft remain synchronized for proper engine timing. These functions are critical for the overall performance and efficiency of the engine.