Conductance and Siemens

Conductance ($G$) is the ability of a material to carry electricity, is measured in Siemens ($S$), and defined indirectly by Ohm's Law as current ($I$) over voltage, or $G = I/V$. The inverse of conductance is resistance.

Conductors are materials that carry electricity well, and thus have a high conductance (and thus a low resistance) value.