After exhaustive CAD & CAE, physical prototypes are required in Product Development.
Physical prototypes are required in a short period of time to meet various needs of Product Development.

Rapid Prototyping (RP) technology enables fabrication of physical prototypes out of various materials.

The most widely used RP techniques are
SLA - Stereo Lithography Apparatus
SLS - Selective Laser Sintering
FDM - Fused Deposition Modeling