what kind of drawing is used in the making stage
Production drawing Production drawings[1][2][3] (sometimes called working drawings) are complete sets of drawings that detail the manufacturing and assembly of products (as distinct from engineering drawings prepared by and/or for production engineers whose task is to decide how best to manufacture the products).
Khan Academy The organization started in 2004 when Sal Khan tutored one of his cousins on the Internet using a service called Yahoo Doodle Images. After a while, Khan's other cousins began to use his tutoring service. Because of the demand, Khan decided to make his videos watchable on the Internet, so he published his content on YouTube.[9] Later, he used a drawing application called SmoothDraw, and now uses a Wacom tablet to draw using ArtRage. Tutorials are recorded on the computer.[10]