What is the definition of exposure in photography?

The English name of Exposure is exposure, which is a combination of shutter and aperture. Exposure mode is the mode in which computers use natural light sources, which is usually divided into various modes, including shutter priority, aperture priority, manual exposure, AE lock and so on.

The quality of the photo is related to the exposure, that is, how much light is needed to make the CCD get a clear image. Exposure is related to light passing time (determined by shutter speed) and light passing area (determined by aperture size).