AutoCAD is a high quality computer aided design (CAD) made for professionals or (even) amateurs architects, designers and engineers, first time released in 1982 and today is the market leader in its niche, even it has many alternatives (free and commercial).
Can be used to create layouts and design different types of engineering projects such as buildings, mechanical, electrical products, schemes etc. in 2D or 3D. With AutoCAD you can create 3D models and print them.
Common file types created by this program are DWG and DXF.
Includes thousands of features, some of them are: command line, work with layers and apply transparency, extract data to tables, use different visual styles, zoom in/out.
Supports plugins and extensions to expand its functionality.