What is the main difference between classes and objects??

Answer 1

the objects are created from the classes; in the classes you define the characteristics and attributes that the objects will have; the objects will have the characteristics of the type of class to which they belong. "A class is the mold to create objects."

ejp:

class User {
  age = 10;
  sex = male;
  name = so-and-so;
}
User person1 = new User ();

This case created an object of the User class, therefore this object will now have the characteristics of its class: age, sex, name.

Answer 2

thanks a lot dear friend Luis Felipe Av