Explain the relationship between class and object

Answer 1

Class is prescription for an object. Class defines a behavior for an object.
Object is actual usage of such class, there can (and usually would) be more instances of same class.

Consider class CartoonCharacter { ... }, then Tom would be one instance (object) and Jerry would be second (different) instance of the same class, in famous caroon Tom&Jerry

Answer 2

An object is an instance of a class.

Answer 3

Thank you