Exposure Metering

https://www.photoreview.com.au/tips/shooting/exposure-metering/

Exposure determination in modern cameras is largely automated, although advanced cameras let photographers override the camera settings and also set exposures manually. An exposure setting has two components: the lens aperture and the shutter speed (how long the light is allowed into the camera). A correct balance between them creates pictures in which all tones in the subject are recorded correctly.