A torus is a three-dimensional geometric 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, characterized by its circular symmetry. In mathematics, the torus is often studied in topology, a branch that explores properties of space that are preserved under continuous transformations. The torus can also be found in various fields, including physics and computer graphics, where it serves as a model for complex structures and phenomena.