Contactors are electrical components used to control the flow of electricity in a circuit. They function as electrically controlled switches, allowing high-power devices, such as motors or lighting systems, to be turned on or off remotely. Typically, contactors consist of an electromagnet, contacts, and a coil. When an electrical current energizes the coil, it pulls the contacts together, completing the circuit. These devices are commonly used in industrial, commercial, and residential applications where automation or remote control of electrical equipment is required.