Imagine you are playing a game where you talk to your friend using flashlights. You can turn the light in two different ways: facing straight or facing a little to the side. These two ways can mean different messages like 'Yes' or 'No.'
Radio Frequency Phase Shift Keying (or PSK) works kind of like that, but instead of flashlights, it uses radio waves. Radio waves are invisible waves that carry sounds or messages through the air, like magic!
In PSK, the radio wave changes its direction just a little bit, not like turning around completely, but shifting its phase. Each way it turns means a different signal or number, like 0 or 1, which makes up all the messages.
So, when your radio or phone wants to send a message, it changes the wave's direction in a special pattern. The receiver, like your friend's radio, sees these changes and understands the message you sent!
That's how PSK helps send messages using radio waves by turning their direction to talk!