Electric charge (electrostatic charge) is the basic property of elementary particles of matter. It can carry negative or positive charge depending on whether it has more electrons (- charge) or protons (+ charge).
SI unit of electrical charge is coulomb (C) which equals to 6.25 x 10 18e. The coulomb is the quantity of charge that passes through an electrical conductor with 1 ampere per second.
Other common units are millicoulomb, kilocoulomb, faraday, franklin, ampere per second.