The apple watch app will be linked or connected to the associated app on the iOS device. One is able to use features & functionalities of the watch app via watch interfaces.
The apple watch app will be the read-only app in this category. This is a rapid and light view version of your current iOS app.
This can be provided to users to take action on the notification in the apple watch. Actions such as, Yes / No, Accept / Decline command to a notification.