https://www.makeuseof.com/what-is-autocad/

What is AutoCAD?  Simply put, AutoCAD is a computer-aided design (thus, the name "CAD") program. 

It was created by Autodesk, a company that primarily produces software and solutions for industries such as architecture & Interior Design, engineering, product design (including Fashion Design), manufacturing, construction, and more.

AutoCAD lets designers create and edit designs and digital images in both 2D and 3D very efficiently. Instead of requiring them to edit images by hand, AutoCAD makes it much easier to manipulate designs.

Essentially, AutoCAD lets designers create geometric models on-screen, offering endless permutations for creating different types of objects and structures. This flexibility is what led AutoCAD to become an industry leader since it could be adopted for use in almost any industry or application.