What different between class and object?

Answer 1

Class is model or blueprint of object which has attributes and methods. Object is (one) instance of his class. Before you do not instance object you can't use and call his: methods, change value of attributes etc.
when you create object then it takes part of memory (ram) where will it be that object and you can use it.

Answer 2

A class is a skeleton or a format which is evident in its objects while an object is an instance of the class, treated as a variable.