Gravity is the force of attraction between two objects that have mass. It is what keeps us on the ground, and it is also what makes things fall when we drop them. The more mass an object has, the greater its gravitational pull.

The Earth has a very large mass, so it has a strong gravitational pull. This is why all objects are pulled toward the Earth. The gravity of the Earth is also what keeps the moon in orbit around the Earth.

The force of gravity is directly proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between them. This means that the force of gravity between two objects will be stronger if the objects have more mass and weaker if the objects are further apart.

Gravity is one of the four fundamental forces of nature. The other three forces are electromagnetism, the strong force, and the weak force.