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Protons are one of the three main particles that make up an atom, along with neutrons and electrons. They are positively charged and are held together in the nucleus by strong nuclear forces. The number of protons in an atom determines its atomic number, which in turn dictates its chemical properties. Protons are crucial for the stability of matter. Without them, the nucleus would not be able to hold together, and atoms would fall apart. They also play a role in the process of nuclear fusion, which powers the sun and stars. In addition to their role in atomic structure, protons are used in various scientific and medical applications. Proton therapy, for example, is a cutting-edge cancer treatment that uses high-energy protons to target tumors with precision. In conclusion, protons are fundamental particles that play a crucial role in the structure and stability of matter. Their importance cannot be overstated in the world of physics and beyond.