3D Geometry is the branch of mathematics that deals with shapes and figures in three-dimensional space. It involves understanding objects that have length, width, and height, such as cubes, spheres, and pyramids. In 3D geometry, we study properties like volume, surface area, and the relationships between different shapes. Key concepts in 3D geometry include points, lines, planes, and angles. These elements help define the position and orientation of objects in space. Coordinate systems, such as the Cartesian coordinate system, are often used to represent and analyze 3D shapes mathematically, allowing for precise calculations and visualizations.