Do i need to know users device ID or Device Token to send notifications to them?

How to send Notification to all those users who have downloaded my applications from apple store ??

Do i need to know users device ID or Device Token to send notifications t开发者_如何学Goo them ?

Assuming that you're referring to push notifications, you'll need to have the users' device tokens in order to send a notification to their devices.

Use Push Notifications.

Alternatively (another meaning): Write them a note in an update. Or write it in the app description in the app store.