They're conical pulleys with variable diameters. The engine powers the enter pulley although the output pulley sends energy into the wheels by either a driveshaft or CV shafts. You turn on your automobile, decide on ‘Travel’ and away you go, without having clutch pedal or gear variations to worry about. https://finnuipxf.ageeksblog.com/31826845/everything-about-gearbox-cvt