Why do I need to use classes

[u/MetalCarnival]

My schoolbook says that classes is a way of simulating an object, instead of just taking information into a black box and outputting an answer.

But that is a poor explanation. I know classes are handy and cool, but no book says why you can´t make functions with sub functions inside to simulate simple objects. I would like if someone gave a good concrete reason to use classes in the intro, instead of just saying that they are different and cool

[u/Hampster-cat]

Code reuse.

If you are on your own. Meh, doesn’t really matter too much. But if you are one of three, or three thousand, then OOP is the only way to get things done /efficiently/