(a) The net charge possessed by a body is an integral multiple of charge of an electron i.e. q = ± ne, where n = 0, 1, 2, 3, ... is the number of electrons lost or gained by the body and e = 1.6 × 10–19 C is charge of an electron. This is called law of quantization of charge.
(b) At macroscopic level, charges are enormously large as compared to the charge of an electron, e = 1.6 × 10–19 C. Even a charge of 1 nC contains nearly 1013 electronic charges. So, at this large scale, charge can have a continuous value rather than discrete integral multiple of e, and hence, the quantization of electric charge can be ignored.