The main purpose of a frame in motor vehicles is to support the body chassis of the vehicle and its components and body also to deal with static and dynamic loads, without undue deflection or distortion which include Weight of the body, passengers and cargo loads. The Vertical and torsional twisting id transmitted by going over uneven surfaces. It is also achieved by moving lateral forces caused by road conditions, side wind, and steering the vehicle and from the Torque of the engine and transmission. Other than a few cars based on motorcycles every motor vehicle had a frame during early 1920s. Nearly all cars have shifted to unit – body construction since then whereas nearly all trucks and busses still use frames. The Longitudinal tensile forces from starting and acceleration as well as compression from braking also contribute to this as well as sudden impacts from collisions. The cross – sections of a conventional frame is a C – shaped, Boxed and Hat. These frames are of 8 types X – frame, Ladder Frame, Backbone tube, Perimeter frame, Superleggera, Platform Frame, Sub frame and Unibody Frame. Older car designs generally have a frame which is separate from the body while most modern cars have a frame which is integrated with the body.