What is electron

Electron:-

        Electron is a negatively charged particle in an atom. Electrons are found around the nucleus in circular paths called Shells.
        Electrons have no known components or substructure. Therefore they are generally considered to be elementry particles.

            In electrical conductors, current flow results from the movement of electrons from atom to atom. 
          The charge on a single electron is considered as the unit electrical charge. It is assigned negative polarity. The charge on an electron is equal, but opposite, to the positive charge on a proton.