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The desktop youre used to�with its familiar folders and icons�is still here. And not just still here, its actually better than before, with a new task manager and streamlined file management. And you can always get to your desktop�and back to your Start screen again�with a tap or click.

whole Reference from windows.microsoft.com

Bing smart search gives you results from your PC, your apps, and the web. Results are in a clean, graphic view so you can quickly get to what youre looking for. (Certain features unavailable in some regions.)

Windows 8.1 lets you work the way you want, and flow smoothly from one thing to another. Pull up a Wikipedia article during a chat with a friend to settle a debate. Play a music video while polishing your resume. Depending on the size of your screen, you can see up to four apps at once. 

It goes where you go.

Use your Microsoft account to sign in to any of your devices running Windows 8.1, and youll see the same layout, apps, and settings. Signing in with your Microsoft Account (which is simply an email address and password of your choice) also gives you access to a world of apps from the Windows Store, and lets you save, view, and edit your documents and photos online with SkyDrive.

SkyDrive is free online storage thats built into Windows 8.1. Save documents, photos, and other files to SkyDrive automatically, and get to them anytime, from any of your PCs or devices. And you can use SkyDrive to protect your files if something happens to your PC.

Internet Explorer 11 is built for touch�now with larger tabs, simpler controls, and fluid response to gestures. Internet Explorer harnesses the power of hardware acceleration, so sites load faster and browsing�s smoother.

The always-on app that makes staying in touch with all your contacts easier than ever. Keep in touch with video and voice calls and instant messaging, all from one app. Call any phone quickly and easily. All Skype-to-Skype video and voice calls are free, and your messages are delivered straight to you no matter what youre doing. Snap Skype left or right and do more while you IM, video call, or keep an eye on your home screen.

Open the Windows Store right from your Start screen to browse and download apps for cooking, photos, sports, news, and a lot more�many of them free. Sort by price, rating, and category. Find old favorites and hot new apps.

Save stuff youre interested in to read later, or share it with friends.