Three-dimensional geometry is the branch of mathematics that deals with shapes and figures in three-dimensional space. It involves understanding points, lines, surfaces, and solids, which can be represented using coordinates in a three-dimensional coordinate system, typically defined by the axes x, y, and z. In three-dimensional geometry, common shapes include cubes, spheres, and cylinders. The study focuses on properties such as volume, surface area, and spatial relationships between objects. This field is essential in various applications, including architecture, engineering, and computer graphics, where visualizing and manipulating three-dimensional objects is crucial.