How the camera arrives at the brighter or darker image you request depends on the exposure mode:
^ In Av (aperture-priority) mode, the camera adjusts the shutter speed but leaves your selected f-stop in force. Be sure to check the resulting shutter speed to make sure that it isn't so slow that camera shake or blur from moving objects is problematic.
^ In Tv (shutter-priority) mode, the opposite occurs: The camera opens or stops down the aperture, leaving your selected shutter speed alone.
^ In P (programmed auto) and A-DEP mode, the camera decides whether to adjust aperture, shutter speed, or both to accommodate the exposure compensation setting.
However, the camera can adjust the aperture only so much, according to the aperture range of your lens. And the range of shutter speeds, too, is limited by the camera itself. So if you reach the ends of those ranges, you either have to compromise on shutter speed or aperture or adjust ISO.
One final, and critical point about exposure compensation: When you power off the camera, it doesn't return you to a neutral setting (EV 0.0). The setting you last used remains in force until you change it.
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