Also, Dark mode finally applies to all of the iPhone's home screen, with options for coloring icons and affecting the brightness of the wallpaper image. Here's how to customize the looks.

So if it’s the day, and there is ample light coming from the window, the light mode works well. After sunset, the white screen ... in dark or light mode. The same applies to wallpaper as well.

Dark mode is a specific setting on a mobile device, tablet, laptop or computer, that changes the default, white or light, screen background to a darker colour (typically dark grey or black).