Gravitational Force

Every object in this universe attracts every other object towards it's center.
The force of attraction between objects is called
Masses is called gravitational force.

The effect of the gravitational force between two small masses is too little to be felt . However,the effects of gravitational force exerted by massive object such as the sun and the earth are easily observable.
Plants are revolving around the sun and moon revolves around the earth due to gravitational force.
If there is no gravitational force of the sun ,the planets will not continue to revolve around it.

The space around an object where gravitational force acts is called its gravitational field.