An engineering drawing, a type of technical drawing, is used to fully and clearly define requirements for engineered items. Engineering drawing (the activity) produces engineering drawings (the documents). The process of producing engineering drawings, and the skill of producing those, is often referred to as technical drawing or drafting.
More than merely the drawing of pictures, it is also a language — a graphical language that communicates ideas and information from one mind to another.
For contractors or civil engineers, architects and designers, engineering drawing is the main media to convey and understand the layout of building, objects, etc. Reading from a drawing gives the clear idea about the requirements of the project. The shapes, dimensions, centre and details of the drawing pretty explains everything about the object. Engineering drawing can be a 2D or 3D representation, however, a 3D presentation is much easier to understand and is descriptive itself.
The video here, is the introduction to the engineering drawing, showing the importance of the subject and its uses in the real life. The video also emphasize on the instruments used in the engineering drawing, their uses and their specific Importance.
It also explains the types of lines and their significance in the engineering drawing. The video pretty much gives enough basic knowledge to anyone who goes through the whole video once.
Go through the video introduction about engineering drawing: