A switch is basically open and close the circuit. And a relay is kind of like a electrical switch. There is a coil and a little magnet in the relay, so when we apply current to that coil, a magnetic field will be created. And that B-field will force the magnet to go up or down which acting like a physical switch to open and close the circuit.
Here is some pictures of the switch and relay...
regular switch
push bottom switch and relay
(the push bottom switch control the current goes in the relay, and the current will make a B-field that acts like another switch)
RED on
GREEN on
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