What is the relation between Classes and Objects?

Class if definition where as object is an instance of a class.
Class id blueprint where as objects are actual object existing in real world.

Lets say CAR is a class. We can define properties like speed , type of car,Brakes. class CAR is only prototype.
We can create real time object using this class CAR ,which can be used to provide functionality.
example we can create Honda car object with 100kmps & urgent brakes.