Conductivity is the ability of a material to allow the flow of electric current or heat. In electrical terms, materials can be classified as conductors, insulators, or semiconductors based on their conductivity. Metals like copper and aluminum are good conductors, while materials like rubber and glass are insulators. In addition to electrical conductivity, there is thermal conductivity, which measures how well a material can conduct heat. For example, copper also has high thermal conductivity, making it useful in cooking utensils. Understanding conductivity is essential in fields like electronics and engineering.