Redline markup drawings that have been produced inspected, and marked up with mistakes, alterations, and modifications are known as redline drawings. Redline Drawings get their name because the markups are usually done in red ink to make them easier to find. CAD design and drafting services are the processes of developing drawings and schematics in software. These services, when compared to drafting using paper and a pencil, have boosted design productivity and reduced the time consecutively.