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In photography, exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance. Exposure is measured in lux seconds, and can be computed from exposure value (EV) and scene luminance in a specified region.
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In photography, exposure is used to mean two things. Photograhic films or sensors have a certain sensitivity. That means that a certain amount of light needs to be able to reach the film or sensor, before the image is correctly exposed. An exposure can also refer to a photo exposed that way.

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