What is an Elementary charge?

The elementary charge is the fundamental unit of electric charge in physics, denoted by the symbol "e." It has a value of approximately (1.602 \times 10^{-19}) coulombs and is the charge carried by a single proton, while an electron carries a charge of (-e). This charge is considered the smallest indivisible unit of charge in nature, and all electric charges are integer multiples of the elementary charge.