Creo is a family or suite of design software supporting product design for discrete manufacturers and is developed by PTC.

Creo Parametric : The flagship application in the Creo Suite, Creo Parametric is the only software you need for 3D CAD and CAM. With Creo Parametric, you can seamlessly combine parametric and direct modeling; open non-native CAD data and collaborate with almost anyone thanks to Unite technology; and relax knowing all downstream deliverables will update automatically. Combine this range of capabilities with ease-of use, and you have a product design accelerator.

Creo Parametric is a cad-cam software widely used for product design and assembly.

It is differ from AutoCAD in such a way that it is based on Parametric which means all the dimensions are Parametric which affect the actual part. For example let us consider a line drawn in AutoCAD and creo both.. Now if we change the dimensions of the line then in AutoCAD it will not affect the line but in creo it will also change the line.. That's the Parametric.

Creo is very powerful tool for part design and assembly.. But it is weak in analysis and cam, so creo is used mostly for part modeling.

Creo parametric is upgraded version for Pro-E software used for modelling,analysis and simulation. It is widely used for product design and development in automobile firms and manufacturing plants.

Apart from this there are other similar softwares like Catia,Solidworks.