Computer-Aided Design (CAD) is a type of software application used by engineers and designers to create, modify, and optimize 2D or 3D designs and models. CAD software provides users with the ability to create geometric models that can be used in various industries, such as automotive, aerospace, architecture, and manufacturing.

The CAD process involves creating an accurate digital representation of a product or structure using specialized software tools. The user can then manipulate and modify the design to meet specific requirements, add annotations and labels, and simulate the behavior of the model under different conditions.

CAD software allows designers to create highly detailed and precise 2D and 3D models quickly and efficiently. It also enables users to collaborate and share design files with colleagues, clients, and suppliers, making it easier to communicate design concepts and ideas.

In addition to creating 2D and 3D models, CAD software can also generate bills of materials, perform stress and thermal analysis, and simulate assembly and disassembly processes. This helps designers to optimize their designs for manufacturability, efficiency, and safety.

Overall, CAD is an essential tool for engineers and designers, providing them with the ability to create accurate and detailed models of products and structures. CAD software has revolutionized the design process, enabling faster and more efficient development of new products, and improving the quality and reliability of engineering designs.