Manual mode is almost always represented on the camera controls by the letter "M". Manual mode is not actually a preset mode. Manual mode returns control of all camera functions (except focus) to the photographer. Automatic/manual focus is controlled separately as it pertains to the lens motor. In manual mode the photographer must determine what combination of shutter speed, aperture, and film speed will create the proper exposure. In this mode the photographer also has free reign to underexpose or overexpose images by whatever margin he/she desired.
This mode is most often used by more advanced photographers wishing complete creative control. This mode is often first discovered by photographers when they are frustrated by their very expensive camera's apparent lack of intelligence when shooting in other preset modes.
Source : http://photography.about.com
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