Question

what is gravity

Answer 1

The acceleration with which a body is pulled towards the Earth (or other planets). Gravitational force at the surface of the earth is called the weight of the body.

Answer 2

There are many definitions of gravitiy, and they are defined by the same thing: the source of gravity. Einstein thought gravity was simply "curved space," and recently it is being thought to be some sort of energy sent by the "gravity waves". It is also simply considered as a kind of force that is made naturally between any masses.