>>724686257
What >>724686123 said basically.

They're called "playing" cards because they've been used to play wide variety of different games for hundreds of years, so depending on the rules of the game everything can be different.

The most consistent thing is typically the value of cards, with 2-10 having the numeric value, then Jack being >10, Queen being >Jack, King being >Queen, and Ace being >King. If you see them in a puzzle that's probably what they're expecting.

The color and suit (the different symbols) are used for different games like when you have to match the same number across suits or get a sequence of numbers in one suit, but typically don't affect the numeric value of the cards.

If you have friends playing cards can be fun, playing card have stuck around for longer than things like YuGiOh or M:TG because they're a lot more flexible and cheaper. There's like hundreds or thousands of games you can play with a deck of playing cards.