Well the full form of CAD is Command Area Development ...just giving a short info.regarding this .Basically this programme is an integrated area development approach towards the command areas of major and medium irrigation projects in the country.The programme is aimed at bridging the gap between created irrigation potential and its utilization in the command areas.. 

CAD stands for Computer-Aided Design.

Definition:
Computer-Aided Design (CAD) is the use of computer software to create, modify, analyze, and optimize designs. It is commonly used in various fields such as architecture, engineering, and manufacturing to assist in the design and documentation of physical objects or systems.

Explanation:
CAD has revolutionized the design process by replacing traditional manual drafting methods with computer software. It enables designers to create and manipulate digital models of objects or systems, allowing for greater precision, efficiency, and flexibility.

Benefits of CAD:
1. Accuracy: CAD software allows for precise measurements and calculations, eliminating human errors that can occur in manual drafting.
2. Efficiency: CAD tools enable designers to quickly create, modify, and iterate design concepts, reducing the time required for the design process.
3. Visualization: CAD software provides 3D visualization capabilities, allowing designers to view and present their designs in a realistic and immersive manner.
4. Collaboration: CAD files can be easily shared and collaborated upon, facilitating teamwork and communication among designers, engineers, and stakeholders.
5. Documentation: CAD software automatically generates detailed drawings, specifications, and documentation, simplifying the manufacturing and construction processes.

Applications of CAD:
1. Architecture: CAD is extensively used in architectural design to create detailed floor plans, elevations, and 3D models of buildings.
2. Engineering: CAD is crucial in engineering disciplines such as mechanical, civil, and electrical engineering for designing complex systems, components, and structures.
3. Manufacturing: CAD is employed in manufacturing industries to design and optimize production processes, machinery, and tooling.
4. Product Design: CAD is widely used in product design to create virtual prototypes, perform simulations, and evaluate design alternatives.
5. Urban Planning: CAD plays a significant role in urban planning by assisting in the creation and analysis of city layouts, transportation networks, and infrastructure systems.

Conclusion:
CAD has revolutionized the design process across various industries by providing powerful tools for creating, modifying, and analyzing designs. Its accuracy, efficiency, visualization capabilities, collaboration features, and documentation capabilities have made it an indispensable tool for professionals involved in design and development.