AutoCAD

AUTOCAD INTRODECTION
  Shortly
AutoCAD is a CAD software application for 2D and 3D design and drafting. It is developed and sold by Autodesk, Inc. First released in December 1982, AutoCAD was one of the first CAD programs to run on personal computers. Early releases of AutoCAD used primitive entities — lines, polylines, circles, arcs, and text — to construct more complex objects. Since the mid-1990s, AutoCAD has supported custom objects through its C++ Application Programming Interface (API). Modern AutoCAD includes a full set of basic solid modeling and 3D tools. With the release of AutoCAD 2007 came improved 3D modeling, which meant better navigation when working in 3D.  

Versions of AutoCAD:
1 AutoCAD
2 AutoCAD LT
3 AutoCAD Freestyle
4 Student versions
5 Vertical programs

AutoCAD LT is a lower cost version of AutoCAD with reduced capabilities First released in November 1993. AutoCAD LT, priced at $495, became the first product in the company's history priced below $1000 to bear the name "AutoCAD". In addition to being sold directly by Autodesk, it can also be purchased at computer stores, unlike the full version of AutoCAD which must be purchased from official Autodesk dealers.