Gravity is a fundamental force of nature that causes objects with mass to be attracted to each other. It is responsible for keeping the planets in their orbits around the sun, and for the falling of objects to the ground. Gravity is described by Isaac Newton's law of universal gravitation and is one of the four fundamental forces in the universe, along with electromagnetism, the strong nuclear force, and the weak nuclear force. Gravity plays a crucial role in the structure of the universe, shaping galaxies, stars, and even the fabric of spacetime itself. Studying gravity is essential for understanding the behavior of celestial bodies and the dynamics of the universe as a whole.