A smaller name and a huge meaning, in fact the complete engineering, a portion of medical and digital graphics fields are dependent on cad, also some other fields like fashion, jewellery, transpotation, and scientific researchs are also using cad on a very large scale. Computer aided design, as the name suggests a design made using computer, or the use of computers (or workstations) to aid in the creation, modification, analysis, or optimization of a design. Cad software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation, and to create a database for manufacturing. Cad output is often in the form of electronic files for print, machining, or other manufacturing operations. So making designs relatively easy, can be made in a lesser time and with more accuracy, can be saved in different formats and at many places. Cad is a very vast field, used by a draughtsman to an aircraft engineer, from a construction contractor to a study a medical practitioner, from a research student to ocean scientist. Cad work includes making plans for construction, interior designs, road layouts, etc. To machine layout, to a 3d model for a product, launched or to be launched, wiring diagram for grids, home or for a machine. The model of a refinery, to the pipeline supplying gas or water, solar cells to solar plants, model of a boat to a warrior ship, a spaceraft to aircraft or a drone