Resistor provides resistance in an electric circuit.
Explanation:
Resistance is a two terminal circuit element that impedes current flow in the electric system. It is primarily used to regulate the flow of current etc. As a process, electrons in the current collide with the resistor material ions thereby making it stringent for the current to flow, thereby causing resistance in the process.
For example, a regulator of fan is used to increase and decrease its speed, this is because of the involvement of a variable resistor.