A 3D model is a digital representation of an object or character created using specialized software. It consists of vertices, edges, and faces that form polygons, which are then rendered to produce a realistic image. In bioinformatics, 3D models are often used to represent molecular structures such as proteins, DNA, and cells, aiding in the study of their functions, interactions, and properties. These models can be manipulated and analyzed to gain insights into biological processes, drug discovery, and disease mechanisms.