A proton is a positively charged particle in an atom's nucleus. For example, a hydrogen atom has one proton in its nucleus.
View Lesson on Atoms & Molecules
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Learning about protons helps us understand matter. This is important for scientists who make new medicines or figure out how to fight diseases. For example, when they understand what is inside an atom, they can make molecules that our bodies can use to heal.
By studying how our bodies work at the atomic level, scientists can understand how things like proteins do their job. Proteins make your heart beat, give your hair its color and more. This knowledge is also behind making insulin proteins for people with diabetes. So, understanding the definition of a proton is really important for keeping us healthy and understanding how life works.
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