Layers are used to group information in a drawing by function and to enforce linetype, color, and other standards.
Layers are the equivalent of the overlays used in paper-based drafting. Layers are the primary organizational tool used in drawing. You use layers to group information by function and to enforce linetype, color, and other standards.
By creating layers, you can associate similar types of objects by assigning them to the same layer. For example, you can put construction lines, text, dimensions, and title blocks on separate layers. You can then control the following:
Every drawing includes a layer named 0. Layer 0 cannot be deleted or renamed. It has two purposes: