Scale-up factor is used to find the larger size of an object or image. We used a microscope to see the larger image of an object. Also, in engineering drawing, the scale-up factor is used to represent the components of smaller sizes used in machines and various equipment. Scale-down factor is used to find the smaller size of an object or image. Many software like AutoCAD or CATIA are used to draw the small-sized components of large machines. These software are also used for the 3D-drawing of construction sites.