Gravitational Force:
Any two bodies in the universe attract each other. This force of attraction  is called gravitational force. The gravitational force is a universal force.

It acts between any two bodies on the earth as well as the earth between the body. Moreover, gravitational force acts between the earth and the sun, the moon and the sun, the planets of solar system and the sun, etc. 

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Gravity or gravitation is a natural phenomenon by which physical bodies attarct each other.
 Isaac newton third's law proposed the universal law of gravitation:
that is when a apple fell from a tree he got the idea of gravitation.Earth pull things towards it this particular force of attraction is gravity.

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