Dark mode is one of the most visible new features in macOS Mojave, and is the most radical change to the interface of Apple’s operating systems since the advent of Mac OS X in 2001. This setting allows you turn most of what you see into a sort of negative view: instead of black text on a white or gray background, you see gray text on a black (actually, dark gray in most places) background. Windows, menus, toolbars – everything shifts (though there are some elements that don’t change; see below).
Dark mode is not for everyone. Reading white text on a dark background can be difficult for many people, notably those with astigmatism. But some people love working like this; it’s a lot more restrained than the standard interface; there is less light to assail you. It is especially good for working late at night which is probably why many developers tend to favor this mode.
Read the rest of the article on The Mac Security Blog.