What is the nature of a proton?

A proton is a subatomic particle found in the nucleus of an atom, carrying a positive electric charge of +1. It is classified as a baryon, composed of three quarks (two up quarks and one down quark) held together by the strong nuclear force mediated by gluons. Protons play a crucial role in determining the atomic number and, therefore, the chemical identity of an element. Their stability and interactions with other particles are fundamental to the structure of matter in the universe.