Card manipulation is like playing magic tricks with playing cards. Imagine if you had a toy car that had tricks you could do where you made the car disappear or change colors. That's kind of what card manipulation is like, but with playing cards instead of toy cars.
People who do card manipulation are called magicians or card manipulators. They use their hands to make the cards move in a really cool and impressive way. They might make the card disappear, move from one hand to the other, or even change into a different card entirely! Some people practice card manipulation as a hobby, while others do it as part of their job, like street performers or professional magicians.
To do card manipulation, you need to be really good at handling playing cards. You have to be able to shuffle them, deal them, and hold them in your hands without dropping them or making mistakes. It takes a lot of practice to get really good at card manipulation, but it can be a lot of fun once you get the hang of it!