Charge comes in multiples of an indivisible unit of charge, represented by the letter e.
In other words, charge comes in multiples of the charge on the electron or the proton. These things have the same size charge, but the sign is different. Electrons and protons are not the only things that carry charge. Those are not going to be discussed, for the most part, in this course, however. The Law of Conservation of Charge The Law of conservation of charge states that the net charge of an isolated system remains constant.