Why is my car ruuning hot? on 2000 Pontiac Grand Prix

When i drive mabey 10 min. my car temp gage runs about 215 why is this?

Asked by for the 2000 Pontiac Grand Prix
Could be many things from a sticking thermostat to a plugged radiator. Have it checked out soon, overheating the engine can be very expensive to repair if not addressed!