Gravitational force is the attraction between two masses, such as the Earth and the Moon. It keeps planets in orbit around the Sun and causes objects to fall towards the ground. This force is described by Isaac Newton's law of universal gravitation and is essential for understanding the structure of the universe. Electromagnetic force is the interaction between charged particles, such as electrons and protons. It is responsible for electricity, magnetism, and the behavior of atoms. This force governs how atoms bond to form molecules, making it crucial for chemistry and the formation of matter in the universe.