What is the main purpose of AutoCAD and SolidWork?

AutoCAD:

AutoCAD commands and options allow you to draw objects of any size or shape. Use AutoCAD to prepare two-dimensional (2D) drawings, three-dimensional (3D) models, and animations. AutoCAD is a universal CADD software program that applies to any drafting, design, or engineering discipline. For example, use AutoCAD to design and document mechanical parts and assemblies, architectural buildings, Civil and structural engineering projects, and electronics.

Solid Works: 

 Solid Works is a3D solid modeling package which allows users to develop full solid models in a simulated environment for both design and analysis. In Solid Works, you sketch ideas and experiment with different designs to create3D models.

Solid Works is used by students, Designers, Engineers, and other professionals to produce simple and complex parts, assemblies, and drawings.

 Designing in a modeling package such as Solid Works is beneficial because it saves time, effort, and money that would otherwise be spent prototyping the design.

which are used to design a complicated engineering designs in a simplest way

AutoCad or any other CAD program have the same purpose.... making lines and shapes into an electronic drawing for production to manufacture. Solid Works is a3D solid modeling package which allows users to develop full solid models in a simulated environment for both design and analysis. In Solid Works, you sketch ideas and experiment with different designs to create3D models.

making lines and shapes into an electronic drawing for production to manufacture. 

AutoCad or any other CAD program have the same purpose.... making lines and shapes into an electronic drawing for production to manufacture.

The point is CAD programs been developed to save time to create drawings and reproducing (copy) them.

AutoCAD is a commercial software application for 2D and 3D computer-aided design (CAD) and drafting 

AutoCAD provides tools for designing and drafting used in the industry, architectures and project management.

   Ceux sont des logicielles  qui aide à la conception et à l'étude des projets 

It is an Engineering Solution tool.

AUTO CAD is used to create the computer aided designs or software applications including drafting.  AUTO CAD develops the application in both the 2D(TWO DIMENSIONAL) and 3D(THREE DIMENSIONAL) formats and provide the information to the application.

To desigh and develop 2D and 3D desighns.