Question

What is the difference between relay and relay module​

Answer 1

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You need a driver circuit. (And, the relay you showed has a 12V coil.) However, if everything is switched together you can drive one or more relays from the relay board (module). And, if that relay board is switching 12V you would want the other relay(s) to have 12V coils.

Answer 2

Explanation:

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