Gravity or gravitation is the tendency of any body to move towards a gravitational center or another body. Isaac Newton, the famous physicist, first came up with the idea of a measure of this attraction. His Universal Law of Gravitation states that any two bodies will attract each other with a force proportional to the product of their masses and will be inversely proportional to the square of the distance between them. Mathematically,
F = Gm1m2/d^2
where F is the gravitational force, G is the universal gravitational constant, m1 and m2 are the masses and d is the distance between the two bodies.
Gravitational force is one of the fundamental forces and is the reason fruits fall down from fruit trees and why it is possible for us to walk on Earth (due to Earth's gravitational pull on the fruit and on us).
Hope this helps.
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