The difference between Volume and Gain, and ”loudness” overall (Audio Engineering)

Question

The difference between Volume and Gain, and ”loudness” overall (Audio Engineering)

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Answer 1

I only know this in the context of running wireless microphones, not normal audio engineering, and this is going to be very ELI5. Turning up the gain on a microphone will make it “capture more sound” while turning up the volume will make that sound louder. Turning up the gain is sometimes necessary for quiet talkers but too much and it gives you feedback and picks up excess sounds.