A torus is a three-dimensional shape that resembles a doughnut. It is formed by rotating a circle around an axis that is in the same plane but does not intersect the circle. The result is a surface with a hole in the middle, which can be described mathematically using equations in geometry. Tori, the plural of torus, are commonly found in various fields, including mathematics, physics, and computer graphics. They can represent complex structures and are often used in modeling and simulations. The shape is also seen in everyday objects, such as lifebuoys and inner tubes.