Gravitational force is the attraction between two objects with mass. It is a fundamental force of nature that pulls objects toward each other. The strength of this force depends on the masses of the objects and the distance between them. For example, the Earth has a strong gravitational force, which keeps us and everything else on its surface. This force is responsible for various phenomena, such as the orbits of planets around the Sun and the falling of an apple from a tree. The law of universal gravitation, formulated by Isaac Newton, describes how this force works, stating that every mass attracts every other mass in the universe.