Address Book now uses an iPad-like user interface. It also includes improved Yahoo support and FaceTime calling.[19]
AirDrop – Lion-to-Lion direct file sharing via Wi-Fi Direct. No wireless access point required.[20]
Address space layout randomization – Address space layout randomization (ASLR), a security technique that puts important data in unpredictable locations, making it harder to target known weaknesses, is available for 32-bit applications, and "has been improved for all applications", in Lion.[21]
Apple Push Notification Service – Send over-the-air alerts, such as news updates or social networking status changes, using Apple's Push Notification service to applications that support APNS. APNS allows Mac OS X Lion and iOS clients to receive push changes to items such as mail, calendar and contacts from a configured OS X Lion Server.[22]
Auto-correction now behaves much like on iOS devices, displaying an iOS-like popup box.[23]
Auto Save – As in iOS, documents in applications written to use Auto Save will be saved automatically so users don't have to worry about manually managing their documents.[24]
Emoji support – Apple has added a new Emoji font commonly used in chat to express ideograms.[23][25]
Exposé in the Dock, a way of activating Exposé for a single application from the Dock, a feature added in Mac OS X 10.6,[26] is altered. One must now double-tap with two fingers on a dock icon to initiate single application exposé, or simply right-click or control-click and select Show All Windows.
FaceTime comes bundled with Lion.[12]
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