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Protons are one of the three main subatomic particles that make up an atom, the others being neutrons and electrons. They have a positive charge and are located in the nucleus of an atom. The number of protons in an atom determines its atomic number and defines its identity as a specific element. Protons play a crucial role in the stability of atomic structure. They are responsible for keeping the nucleus together through the strong nuclear force, which overcomes the repulsive forces between positively charged protons. Without protons, atoms would not be able to exist in their current form. In addition to their role in atomic structure, protons also have important applications in various fields such as medicine, specifically in proton therapy for cancer treatment. This therapy targets tumors with high precision, minimizing damage to surrounding healthy tissues. Overall, protons are fundamental building blocks of matter and have significant implications for understanding the universe at a fundamental level.