So this is going to be a toddlerish level explanation
So if you seen anything about Morse code which convert alphabets numerical into set of high and low level represented by flashing light, telegraph or voltage level you can transmit sentence over distance wired or wireless(flashing light).
Now everything from text to music to video to application file or data can be represented as group of 0s(low) and 1s(high).
So what’s happening between two Bluetooth device is that they send and recive those 0s and 1s fast enough to minimize any glitch and that’s the magic behind Bluetooth.
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