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The term AutoCAD was derived from the shortening of the words "automated computer-aided design". This term was coined in the early 1980s, and the first AutoCAD was not released until December 1982. The original AutoCAD could only be purchased with an Intel 8088 microprocessor. The first version of AutoCAD was only usable on a single computer, and was limited to running on the PC, either on a standalone desktop or a workstation connected to a mainframe or minicomputer.
The term "AutoCAD" was also used as a verb as in "AutoCAD design" or "AutoCAD creates".
The term AutoCAD is also used to describe a stand-alone desktop app for personal use that provides a limited set of functions and allows users to create simple geometric shapes and drawings. The first AutoCAD stand-alone apps were sold in the early 1990s. AutoCAD stand-alone apps also exist on the Apple iOS, Google Android, and Windows Phone 8 and later platforms. AutoCAD stand-alone apps are still available for purchase from the AutoCAD website.
AutoCAD is the most popular CAD software application. Some analysts estimate that more than 100 million people use AutoCAD. Another estimate indicates that more than 90 million users use AutoCAD. The software has an estimated user base of more than 1.3 billion. The market value for AutoCAD products is estimated at more than $1.5 billion. The total sales of AutoCAD products exceeded $1 billion in 2016.
AutoCAD is an industry standard and has served as the standard for both licensed and self-licensed CAD software for more than three decades. The original AutoCAD system (i.e., the first "AutoCAD") was developed in a different era and has very limited capabilities compared to modern CAD systems. There are many other commercial CAD software products available. Some CAD software products, such as DraftSight and TopCad, have larger markets than AutoCAD, and some manufacturers of CAD software products have developed their own proprietary CAD software products. Some of these CAD software products offer similar functionality as AutoCAD, while others offer unique functionality.
"AutoCAD" refers to the word as a shortening of the term "automated computer-aided design". This term was first used in 1982 when the first AutoCAD was released
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Physical characteristics 
AutoCAD uses a flat-file database to store and render the data that it generates. The "database" is stored in the native file system of Windows, Linux, or Mac operating systems. Some older versions of AutoCAD used an old and inefficient in-memory database. This allowed faster rendering of the user interface. Some technical products also use AutoCAD as a debugging tool and provide a snapshot mode that stores the drawing history in a database.
AutoCAD uses 3.5" diskettes for saving its drawings and various tool files, and includes support for a variety of different file types, including.DWG, AutoCAD native format, and EPS. AutoCAD also includes support for standard import/export file formats such as DXF, EMF, DWG, CADPAT, and many more.
File types 
AutoCAD stores drawings in a database format known as the AutoCAD Drawing database (ADM) file format, which is a flat-file based database.
The drawing database is an ordered table of objects, which can represent anything from a simple 2D line to a complex 3D model. It consists of record and attribute sections. The record section consists of numbered fields, in a fixed order, each of which is an ASCII character, and represents either a property of an object, or a property of a field. Each field can consist of a sequence of records, delimited by carriage returns (CR) and line feeds (LF) in the file.
The attribute section is optional, and consists of records of attribute definitions and names. The attributes are used to define the properties of a shape or an entity. 
An object, in this context, is a specific type of drawing entity. Any object can have an arbitrary number of properties. There are a number of predefined attributes, as well as object-specific attributes that are used to describe the properties of the objects that it is generated by the software.
Users can add their own custom attributes, allowing the ability to store the data in any format that can be read by the application. The attribute section is also used to store custom objects. This is typically used to store coordinate data for drawings, and is achieved by referencing the information in the database record of the object. The attributes are defined in a separate file or by the application itself.
Different parts of an object can be organized into logical groups. This is done by nesting records
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