Physics is the branch of science that deals with the study of matter, energy, and their interactions. It seeks to understand the fundamental laws that govern the behavior of the universe, from the smallest subatomic particles to the largest structures in the cosmos. Physicists use mathematical models and experiments to explore the physical world and explain phenomena such as the behavior of particles, the forces that govern motion, the properties of materials, and the structure of the universe. Physics is a fundamental science that underpins many other fields, including chemistry, engineering, and astronomy, and has practical applications in technologies such as electronics, telecommunications, and energy production.