Electric sink faucet, HUH?

Saw electric sink faucets for sale on an RV website. Is this something I need to have? I was just about ready to plumb up a shurflo water pump to deliver water to the galley sink. I had assumed that once I opened the faucet for the water, the pressure would cause water to flow and the pump would continue to create water flow until I shut off the faucet... Am I mistaken????
Does the water pump require an electric signal from the faucet to start water flowing from the tank to the sink? I see many "standard" (non-electric) water faucets for sale on RV websites. What am I not understanding? I guess my RV newbness is showing...
Help Please and thanks in advance for you assistance








