Resistivity is a material property that quantifies how much a material resists the flow of electric current. It plays a crucial role in the design of electrical components, where materials with low resistivity are used to conduct electricity efficiently. From wires to resistors, knowing the resistivity of materials like copper, rubber, and semiconductors is essential for creating effective circuits. This category helps us understand the challenges of managing electricity and the characteristics that determine a material's ability to resist current flow.