Inductors
Inductors are normally used in analog circuits.
An inductor is a component that stores energy. They do this by storing energy in a magnetic field whereas capacitors store energy using electric fields.
Inductors are made by winding wire around a coil. When a current passes through this coil a magnetic field is generated to store the energy. Normally, inductors are made from copper wire (copper is a very high conductor).

www.answers.com