When opening CAD system, the system creates a new empty drawing, we can see in the drawing there are points(in lower version of CAD) or lines(in higher version of CAD) that are equidistant from each other, which is called grids. So what’s the use of grids in CAD.
Inserting image like this has a problem: when we copy the drawing to others, we will have to attach the image file, otherwise, the image won’t show in the drawing that we send to others. That’s why most of the time CAD users prefer to insert an OLE image since the OLE image is saved in the drawing and there is no need to attach the image again.
CAD users can put different geometric objects on different layers and control the color, linetype, lineweight and other properties by customizing the layer properties. The properties of some CAD objects are set bylayer by default and putting those objects on the specific layers will save you time and there is no need to customize them respectively.