Long awaiting dark mode of WhatsApp a Facebook company has arrived for both Android and IOS (Apple) users.
Dark mode is pure black in IOS and is of dark grey for Android users.
Mode can be activated by opening WhatsApp application and going through following menus
1. Click of Settings
2. Select Chats
3. Select Theme
4. Select Dark & tap OK
Dark mode is by default activated for Android 10 version users if phone setting is set to dark mode.