It is very simple to identify an object with its physical shape, color and appearance but it is merely not a simple task to understand its function, origin, importance and its existence. Here apple is a very simple example to know and learn about an apple. What is an apple? It is simply one of the famous fruits, either red or green, or perhaps any other colors. It reassembles orb, sphere, circle or sometimes -an oval shape that reminds bubble, ball, globe, area, space and itself the whole universe. Once I know an apple then I would get a chance to know about the related objects. But still what is an apple? Well, it is an object like some others. Then I would ask a question that what are the differences between an apple and any other objects? Why is it an apple, not something else?