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Particle physics is a branch of experimental physics concerned with the observation, study, and understanding of fundamental particles and their interactions. It explores phenomena at extremely small scales, where the traditional laws of physics begin to break down and new ones emerge. This field seeks to uncover the most basic building blocks of matter, as well as the forces that govern their behavior. In this context, "matter" refers to everything that has mass and occupies space, from stars and planets to atoms and subatomic particles. The findings in particle physics have far-reaching implications for other areas of science and provide insights into the origins and evolution of our universe.