What is the function of a relay in an electronic circuit?

@janet 

The function of a relay in an electronic circuit is to control the switching of a higher power or voltage circuit using a lower power or voltage signal. It acts as an electromechanical switch and is capable of controlling both AC and DC circuits. When a small current or voltage is applied to the relay coil, it produces a magnetic field that activates the mechanical contacts within the relay, allowing the larger current or voltage to flow through the circuit it is connected to. Relays are commonly used in applications such as circuit protection, motor control, automation systems, and safety applications.