AutoCAD is a computer-aided design and drafting software application developed and marketed by Autodesk, Inc. It allows users to create 2D and 3D drawings and models of buildings, infrastructure, and other objects. AutoCAD is widely used in industries such as architecture, engineering, construction, manufacturing, and more. It provides a range of features including 3D modeling, parametric constraints, and a large library of blocks and symbols. AutoCAD can also be extended with additional functionality using custom plugins. It is available on multiple platforms including Windows, Mac, and mobile devices.