3D models are digital representations of objects or scenes created using specialized software. They consist of points in a three-dimensional space, connected by lines and surfaces to form shapes. These models can be simple, like a cube, or complex, like a detailed character from a video game. 3D models are widely used in various fields, including architecture, animation, and video game design. They allow designers and artists to visualize and manipulate objects in a virtual environment, making it easier to create realistic images and simulations.