Live tiles and badges in a Windows Store app helps with the popularity of the application. Live tiles can be updated regularly by your app or by using push notifications to deliver fresh content.
Secondary tiles enable users to launch your app for a specific purpose; they can be enhanced by live tile updates, thereby making them very attractive and useful.
Badges can provide a summary of new items available or the status from an app. Badges can be displayed on the lock screen, which helps with communication from your app with the users.
Toast notifications deliver transient messages to the user, even when your app is not running. Toast notifications can be configured for the duration in which they are visible and the sound played ...