An inductor coil is a passive electrical component that stores energy in a magnetic field when an electric current flows through it. It typically consists of a wire wound into a coil shape, which enhances its ability to store energy. Inductors are commonly used in various electronic circuits, including filters and oscillators, to manage current flow and reduce electrical noise. The behavior of an inductor is characterized by its inductance, measured in henries (H). When the current through the coil changes, the magnetic field also changes, inducing a voltage that opposes the change in current. This property is described by Faraday's Law of Electromagnetic Induction, which is fundamental to understanding how inductors function in electrical engineering.