How to turn on dark mode in Windows 10

Dark mode is the latest UI design trend. Windows 10 also jumps on the bandwagon. It keeps light mode as the default. To enable dark mode, open Windows Settings. In the search box, type in "dark mode". Select "Turn on dark mode for apps".

In fact, there are 2 dark modes in Windows. One is for Windows Explorer, and the other for apps. 

Adjust them for your preference. One light one dark or both dark.

You may or may not see dark mode in apps or web sites. It depends on if they support it,