Notification Center is a feature in iOS

IOS

iOS is an operating system for iPad, iPhone, iPod Touch, and Apple TV.IOS may also refer to:-Companies and organisations:* Illinois Ornithological Society, American state-based bird club...

 in which the user can see alerts from applications on the device. It was developed by Apple Inc. and released with iOS 5 on October 12, 2011.

Features

The notifications in Notification Center collate in a window which can be dragged down from the menu bar. If the user touches the notification, they will go to the application that the notification is from. There are three flavors of notifications: Banner-style messages strip across any app that are being used, including the phone's lock screen. Alerts are the familiar, large blue screens that pop up and demand action before being dismissed. The weather, phone, Messages

IMessage

iMessage is an instant messenger application developed by Apple for iOS 5. iMessage was released on October 12, 2011 to the general public.-History:iMessage was announced by Scott Forstall at his keynote speech on June 6, 2011 at the WWDC 2011...

, calendar, stock, mail, and Game Center

Game Center

Game Center is an online multiplayer social gaming network released by Apple. It allows users to invite friends to play a game, start a multiplayer game through matchmaking, track their achievements, and compare their high scores on a leader board.-History:...

 applications are the default applications that are supported within Notification Center. The Apple-designed applications Apple Store

Apple Store (online)

The Apple Store is the online store of Apple Inc.. All of Apple's product lines are carried as well as select brands of accessories for its products. It is owned and operated by Apple in Cupertino, California...

 and Cards

Cards (iOS)

Cards is a card creation application developed by Apple for iOS 5. Cards was released on October 12, 2011 to the general public.-Creation:Cards allows users to create cards and obtain them physically...

are supported as well. Notification Center can also be customized to be viewed on the lock screen. A user can respond to a notification on the lock screen by swiping on it.