Digital cameras look very much like ordinary film cameras When you press the button to take a photograph with a digital camera, an aperture opens at the front of the camera and light come to the lens. After light come sensor and pixels percevie the light.
Then,light convert electrical energy and colors appear according to electrical level.İf you want take good photos in low light
You need thes :
1: bigger sensor
İf you have bigger sensor pixels will bigger and get more light in it.
For example : 1/2 inch sensor bigger than 1/3 so 1/2 inch sensor get more ligt
2: aperture
Aperture is a bit different because if aperture is low ,it will be better in low ligt .
Aperture is show with "f".
For example f1.5 better than f1.9