Computer-aided design (CAD) is a branch of engineering and design that involves the use of computer software to create, modify, analyze, and optimize designs. CAD is widely used in various industries such as architecture, automotive, aerospace, and manufacturing to produce detailed drawings and models of products, buildings, and structures. CAD software allows designers and engineers to quickly and efficiently create 2D and 3D models of their designs, make changes and revisions easily, and simulate how the design will perform in real-world conditions. CAD systems also enable collaboration between multiple team members, as designs can be shared, reviewed, and modified in real-time. Overall, CAD technology has revolutionized the design and engineering process by improving accuracy, efficiency, and productivity. It has become an essential tool for professionals in various industries to bring their ideas to life and optimize the design process.