Belt drives transmit rotational motion between shafts using pulleys connected by belts. There are several types of belts, including flat, V, and circular belts. A belt drive consists of two pulleys over which an endless belt is passed, transmitting power from the driving pulley to the driven pulley via friction. Different types of pulleys are used depending on the application, including open belt drives where shafts rotate in the same direction, crossed belt drives where shafts rotate in opposite directions, and stepped cone pulleys which allow variable speed control. Belt drives provide an efficient means of power transmission over varying distances with low noise and maintenance requirements.