Toroidal core inductor

A length of wire is wrapped around a donut-shaped core is commonly known as a toroid core inductor. The core material is ferrite so, the material properties resemble a ferrite core inductor.
This type of core can contain a magnetic field very well because of its closed-loop nature, thus improving the size and inductance.
Due to the high magnetic field and high inductance value with fewer windings, the impedance is very less which helps to improve the efficiency of the inductor.