Electrical resistivity is a concept in electrical engineering. It is a measure of how much an electrical conductor stops the flow of electricity through it. Most metals have a very low electrical resistivity.
In other words "the resistivity of a material of conductor is the resistance of its unit area of cross section and per unit of its length" The S.I[System International] uses the ohm metre for measuring how much electrical resistivity there is. Electrical resistivity is also inverse of electrical conductivity. This term is more meaningful in case of semiconductors and insulators.