The document discusses the use of layers in AutoCAD. It explains that layers allow designers to separate different elements of a drawing onto individual layers for improved organization and visibility. Key points include: - In AutoCAD, layers function similarly to overlays in manual drafting by allowing elements to be grouped and manipulated separately. - Drawings for mechanical, architectural, interior, and electrical designs commonly use over 100 layers to separate elements like views, dimensions, plans, and systems. - Proper layer naming and management is important for efficiently working with elements on different layers.