Almost all material has some form of resistance to electrical flow. Without resistance, you’d have no way for a circuit to do useful work. Like stated earlier, conductors are materials that allow current to flow, and insulators don’t. Conductors have little resistance.
Resistance in a circuit is measured in Ohms or the Greek letter “Ω.” Current flowing through an electric range or toaster causes the elements to generate heat to cook your food by using resistance. In Ohm’s Law, resistance is represented by “R.”