It provides the shape description of an object. It shows two or more two-dimensional views of a three-dimensional object. This helps communication between designers and manufacturers.
All three-dimensional objects have a width, height, and depth and each one are a key part to drawing your multi-views. Width is associated with an object's side-to-side dimension. Height is associated with an object's top-to-bottom dimension. Depth is associated with front-to-back distance.
This is an example of a 3d-dimensional object drawn as a 2d-dimensional picture to show each of its views which are the Top, Front, Right Side/Left
This shows you that each part of your view has to be perfectly all aligned with each other. There is the width, height and depth involved to help with the alignment of your 2d-dimensional drawing views
It is a technique used to create Multi-View drawings. Any projection of the features of an object onto an imaginary plane of projection.
There are six total glass walls surrounding the entire object. Each wall representa a projection plant which is where your 2-dimensional object view is created.
Another way of calling it is the plane of projection or picture plane, is an imaginary surface that exists between the viewer and the object.
There are different views you can focus on and imagine of the projection plane. A person standing in front of the objetc would see only the five corners identified in black.
Projection lines are used to project each corner outward until they reach the projection plane.
The visible edges of the object are then identified on the projection plane by connecting the projected corners with object lines.
Here is a photo of an object and you draw all 6 different views of that object. This requires you to actually use your imagination and thought to be able to get each view.