Answer:
Orthographic drawing is a way of drawing a three dimensional object. Normally the object is drawn as three separate, related views - Front View, Side View and Plan View.
The example below shows a simple shaped block, with a hole drilled all the way through.
The front view, is a drawing of the block, as if you are looking directly at the front of the object.
The side view, is a drawing of the block, when it has been rotated so that one of its sides is now directly in view.
The plan view, is a ‘birds eye’ view, from above.
Dotted lines represent ‘hidden detail’. In this case they represent the hole, through the block/object.
