What do you mean by overexposure and underexposure?

Overexposure means overexposure, and the light is too bright; Underexposure means underexposure, insufficient light, and need to enter light.

Overexposure and underexposure are terms in photography, which are generally used in SLR.

Underexposure of the picture means that the light is too dark, resulting in low brightness of the picture; Increase the amount of light: one of the most commonly used methods is to slow down the shutter speed, which can greatly improve. Night shooting mainly relies on low shutter to achieve exposure, but it needs a tripod to use.

In photography, exposure refers to the amount of light allowed to enter the lens and shine on the photosensitive medium (the negative of a film camera or the image sensor of a digital camera) during photography. "Exposure" can be controlled by the combination of aperture, shutter and sensitivity of photosensitive medium.