CAD (Computer-Aided Design) refers to software tools that help engineers, architects, and designers create precise drawings, plans, and 3D models. These programs streamline the design process, allowing users to visualize, modify, and optimize products or structures before they are built. CAD is widely used in industries like architecture, automotive, aerospace, and manufacturing to improve accuracy, reduce errors, and increase productivity. The technology supports both two-dimensional (2D) drafting and three-dimensional (3D) modeling, making it essential for modern design and engineering workflows.