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Protons are positively charged subatomic particles that are a crucial component of atoms. They are found within the nucleus of an atom, along with neutrons. Together, protons and neutrons make up the majority of an atom's mass, while electrons orbit around the nucleus. The number of protons in an atom determines its atomic number, which in turn defines the element. For example, an atom with one proton is hydrogen, while an atom with six protons is carbon. Protons are held together in the nucleus by the strong nuclear force, which overcomes the repulsive forces between positively charged protons. In addition to their role in atomic structure, protons are also used in various fields such as medicine, specifically in radiation therapy. Proton therapy is a type of cancer treatment that uses high-energy protons to target and destroy tumor cells while minimizing damage to surrounding healthy tissue. Overall, protons play a crucial role in the world of physics and have widespread applications in various scientific fields.