DND stands for "Do Not Disturb" mode on a smartwatch. It is a feature that silences all incoming calls, notifications, and alarms on the watch. There are different types of DND modes available on smartwatches, including:

• DND mode: In this mode, the call reminder, SMS reminder, app notification reminder, and mail reminder will cease to remind the user, but the watch will still generate contents, and you can view all the unread notifications in the notification list.

• Smart DND mode: The DND mode will be enabled automatically once the watch detects that you have fallen asleep.

• Timed DND mode: You can customize the time period during which DND mode is automatically turned on or off.

Enabling DND mode on a smartwatch can be useful in situations where you dont want to be disturbed, such as during a meeting or while sleeping. The exact steps to enable DND mode may vary depending on the smartwatch model, but it is usually accessible through the watchs settings or quick settings menu.