What is the difference between object and instance ????

Answer 1

They are not the same.
Instance - Before Memory Allocation
Object - After Memory Allocation

Answer 2

Nothing, both are same.
In general, Instance means example.
Object is said to be an instance of class.
Class is always defined and use. When somebody asks you - what is the example of class you made? Show him it's object. Because Objects are instance of class.

Answer 3

Object ia instance of class. Basically they mean same thing.