A toroid is a three-dimensional shape that resembles a doughnut or a ring. It is created by rotating a circle around an axis that is outside the circle itself. This geometric figure has a hollow center and is often used in various fields, including mathematics, physics, and engineering. Toroids can be found in many practical applications, such as in the design of inductors and transformers in electrical circuits. Their unique shape helps to confine magnetic fields, making them efficient for energy transfer. Additionally, toroidal shapes are studied in topology, a branch of mathematics that explores the properties of space.