Physics is the science of understanding how the universe works at its most fundamental level: how things move, why they fall, what energy is, how light travels, and what matter is made of. Physics explains everything from why a ball bounces to how stars shine to why your smartphone works.

Physicists study the basic rules that govern all of nature. When you kick a soccer ball, physics describes the forces that make it curve through the air. When you flip a light switch, physics explains how electricity flows through wires. When you look in a mirror, physics tells you why you see your reflection. The laws of physics apply everywhere in the universe, from the smallest atoms to the largest galaxies.

Physics has led to countless inventions and technologies: electric power systems, computers, airplanes, medical imaging machines, solar panels, and much more. Understanding physics helps engineers design bridges that won't collapse, helps doctors treat cancer with radiation, and helped scientists put astronauts on the Moon.

When you study physics, you're learning nature's deepest rules, the ones that make everything else possible. It's the foundation for chemistry, engineering, and most modern technology. Physics answers the question: How does this actually work?