The Do Not Disturb mode is a setting that mutes all sounds and vibrations, making it a very useful option when wearing the watch in, for example, a theater or any environment where you want the watch to operate as usual, but silently.
To turn on/off the Do Not Disturb mode:
When Do Not Disturb mode is activated a Do Not Disturb icon is visible in the watch face view.
If you have an alarm set, it sounds as normal and disables Do Not Disturb mode unless you snooze the alarm.