All apps on Start: Simply click the Down arrow button or swipe up from the bottom of the screen to see all installed apps.Highlights newly installed apps: The Start screen now highlights newly installed apps to help you easily access them.Network behavior monitoring: Windows Defender now comes with network behavior monitoring feature to provide better protection to your PC.
The Start button: Microsoft has restored the Start button in Windows 8 to help users quickly switch to the Start screen.
Right-click on the Start button to see Power User Menu (Windows X menu) containing shut down, restart and a couple of other options.
Set desktop background as Start screen background: 8.1 comes with an option that lets you automatically set the desktop background picture as the Start screen background.
When you change the desktop background, Windows automatically applies the new picture to the Start screen background.
Slide to shut down: Slide to shut down is one of the hidden features present in Windows 8.1.
As the name suggests, you can use this feature to shut down your PC with a touch gesture or a simple drag.
Assigned access: Available in Windows 8.1 RT, Windows 8.1 Pro, and Windows 8.1 Enterprise, it lets you enable a single Windows Store app experience on your PC or tablet.
Sync tabs in IE11: Internet Explorer 11 supports syncing tabs across multiple Windows 8.1 PCs.
Multi-monitor support for apps: Modern apps now fully support multi-monitor setup.
Automatic updates of Modern apps: Windows 8.1 automatically checks and updates all modern apps installed from the Store and requires no manual intervention.