Definition of three views: three views are the general name of front view, top view and left view;

Front view: refers to the view obtained when the image of the object is projected on the projection plane of the back when viewed from the front of the object; Top view: the view obtained from the orthogonal projection above the object; Left view: the left view refers to the view whose viewpoint is on the left side of the object and projected on the right side of the object;

The view can only reflect the shape of the object from one direction, but not the structural shape of the object; Three views are the result of projecting the same object from three different directions. In addition, there are sectional views and semi-sectional views as AIDS, which can basically express the structure of the object completely.