AutoCorrect is used for automatically correcting spelling mistakes you make using Microsoft Word. For example, if i spelled the word exactly without a "t," AutoCorrect would allow me to automatically change it to the right spelling.
When you try to type a word that you made up or mispell something it corrects it and either doesnt make sense or is a bad word
you can click the auto correct options button to undo an automatic correction
An autocorrection is an instance of automatic correction, especially by a word processor.
The update contains over 200 new features, including the following:Notifications Swipe from the top of any screen to view notifications in one place with Notification CenterNew notifications appear briefly at the top of the screenView notifications from lock screenSlide the notification app icon to the right on the lock screen to go directly to the appiMessage Send and receive unlimited text, photo, and video messages with other iOS 5 usersTrack messages with delivery and read receiptsGroup messaging and secure encryptionWorks over cellular network and Wi-Fi*Newsstand Automatically organizes magazine and newspaper subscriptions on Home ScreenDisplays the cover of the latest issueBackground downloads of new issuesReminders for managing to do lists Syncs with iCloud, iCal and OutlookLocation-based reminders when you leave or arrive at a location for iPhone 4S and iPhone 4Built-in support for Twitter Sign-in once in Settings and tweet directly from Camera, Photos, Maps, Safari and YouTubeAdd location to any tweetView twitter profile pictures and usernames in ContactsCamera improvements for devices with cameras Double click the home button when device is asleep to bring up a camera shortcut on iPhone 4S, iPhone 4, iPhone 3GS and iPod touch (4th generation)Volume Up button to take a pictureOptional grid lines to line up shotsPinch to zoom in the preview screenSwipe to camera roll from preview screenTap and hold to lock focus and exposure, iPad 2 and iPod touch (4th generation) only support exposure lockPhoto improvements for devices with cameras Crop and rotateRed eye removalOne tap enhanceOrganize photos into albumsMail improvements Format text using bold, italic, or underlined fontsIndentation controlDrag to rearrange names in address fieldsFlag messagesMass mark messages as flagged, read or unreadCustomize mail alert soundsS/MIMECalendar improvements Year view on iPad and new Week view for iPhone and iPod touchTap to create an eventView and add event attachmentsGame Center improvements Use personal photos for your Game Center accountCompare your overall achievement scores with your friendsFind new Game Center friends with friend recommendations and friends of friendsDiscover new games with custom game recommendationsAirPlay Mirroring for iPad 2 and iPhone 4SMultitasking Gestures for iPad 2 Use four or five fingers to pinch to the Home ScreenSwipe up to reveal the multitasking barSwipe left or right to switch between appsOn-device setup, activation and configuration with Setup AssistantSoftware updates available over the air without tetheringiCloud support iTunes in the CloudPhoto StreamDocuments in the CloudApps and Books automatic download and purchase historyBackupContacts, Calendar, and MailFind My iPhoneRedesigned Music app for iPadHourly weather forecastReal-time stock quotesWireless sync to iTunesKeyboard improvements Split keyboard for iPadImproved autocorrection accuracyImproved Chinese and Japanese inputNew Emoji keyboardPersonal dictionary for autocorrectionOptionally create keyboard short cuts for frequently used wordsAccessibility improvementsOption to light LED flash on incoming calls and alerts for iPhone 4S and iPhone 4Custom vibration patterns for incoming calls on iPhoneNew interface for using iOS with mobility-impairment input devicesOption to speak a selection of textCustom element labeling for VoiceOverExchange ActiveSync improvements Wirelessly sync tasksMark messages as flagged, read or unreadImproved offline supportSave a new contact from a GAL serviceMore than 1,500 new developer APIsBug fixes