Think of it like two people holding a rope.
Person A is holding one end of the rope, and Person B is holding the other end. Person A is moving their end up and down, causing a wave in the rope. Person B can feel the rope moving and can tell if Person A is making big waves or making small waves.
They have previously agreed that making a small wave means no, making a medium wave means maybe, and making a large wave means yes
This is like the electromagnetic waves going from antenna to antenna. It’s by no means a perfect example, but it shows the general idea.
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