The notification bar is the place used to display notifications so you can know what’s going on. Everything that happens in the device is notified to the notification side to inform the user of those things. The main feature of the notification wall is only used to do something; every day, there are many notices is sent, so usually, the message will be full. Users also need to visit the notification bar multiple times to know what’s in it and also to clean up the notification bar. Wallpaper is changeable, the look of the device can also be changed, but no one can change anything of the notification bar except the layout.