As you might know the new Windows operating system, Windows 8 is a touch-centric and more mobile oriented than any earlier Windows versions. On touch-enabled PCs, Windows 8 touch interactions let you manipulate the things on your screen in a way that feels comfortable. It has all the little niceties you’d expect to make a touch screen device feel right, including several built-in touch keyboards. Here are a few common Windows 8 gestures.
Comparing to Windows7, Windows 8 has following features
System Requirements: Windows 8 works on any PC that works Windows 7, though it may use even fewer resources. Also, it supports ARM system-on-chips and touch-based tablet PC and desktop PC.
Hardware support: Windows 8 has built-in support for USB 3.0, many printers, many sensor types, and data modems.
Cloud Integration: Log in with your Live ID, and settings, data, and Metro apps sync automatically across cloud services like Microsoft Hotmail, Microsoft Messenger, Facebook, LinkedIn, Twitter, and more.
Security: Defender upgraded to fight all malware types. TPM extends to hardware verification and Smart Screen filter enabled throughout the OS.
Performance: Performance wise Windows 8 seems to be faster and more efficient than Windows 7. (via)