I am in the design field, can I please know the difference between AUTOCAD 3D and 3Ds MAX?

AutoCAD Program is generic design software; it is intended for a wide range of 2D and 3D users. There is some rendering capability. It can accept a wide range of third-party customizations to do everything from circuit board design to architectural work (2D and 3D).

3DSMAX Program is presentation software; it is intended for rendering high-quality stills and animations (if I remember correctly, parts of the movie Jonnhy Nmemonic were done with an early version of MAX). The program itself is fairly easy to learn but requires a lot of additional learning in areas such as color theory, light theory, and camera direction in order to produce good results.