Telephone tapping is when someone listens to the conversations that you have on your phone. It's like someone is listening to everything you say, even though you don't know they're there. It's like having an invisible eavesdropper that's always listening. The person doing the telephone tapping can hear both sides of the conversation, so they can hear what you and the other person are saying. It's very important to know that telephone tapping is illegal in most countries, so don't do it without permission.