Subatomic physics is the branch of physics that studies the properties and behavior of particles that are smaller than an atom. This includes particles such as protons, neutrons, electrons, and quarks, as well as the interactions between these particles, such as the strong and weak nuclear forces. Subatomic physics plays a crucial role in understanding the fundamental building blocks of matter and the forces that govern their behavior. This field of research has led to significant advancements in our understanding of the structure of the universe and has practical applications in areas such as nuclear energy, medical imaging, and particle accelerators.