An H-bridge is an electronic circuit that allows a voltage to be applied across a load in either direction. It is commonly used to control the direction of motors, enabling them to rotate clockwise or counterclockwise. The name "H-bridge" comes from the typical configuration of the circuit, which resembles the letter "H." H-bridges are essential in robotics and automation, where precise control of motor movement is required. They can be built using various components, including transistors, diodes, and integrated circuits. By switching the transistors on and off, the H-bridge can change the polarity of the voltage applied to the motor.