what is gravity? please explain

Gravity is the force by which two bodies attract themselves by the virtue of their mass. This force is directly proportional to the product of the mass of the two bodies and is inversely proportional to the square of the distance between them.
F=Gm1m2R2where,G = Gravitational constant=6.67 × 10-11 m3 kg-1 s-2m1 and m2 are the masses of the two bodiesR is the distance between them.

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