Physics is a fundamental branch of science concerned with understanding the nature of the universe at its most basic level. It studies matter and energy, how they interact, and how these interactions are governed by forces operating across space and time. By examining phenomena ranging from subatomic particles to galaxies, physics seeks to identify universal laws that explain motion, structure, change, and the behavior of natural systems. These principles form the foundation for many other scientific disciplines and drive technological advancements that shape modern life.