Control Center is integrated in iOS7. Access it by swiping up from the bottom edge of your screen.
Then you'll see the control center.
You can do this anywhere - on your home screen (upper left), you lockscreen (upper right), in any app (lower left) and while navigating (lower right)
So, what can you do with it??
On the top, you can quickly turn on and off Flight Mode, Wireless LAN, Bluetooth, Do Not Disturb Mode and Rotation Lock.
Below you can adjust your screen brightness
Control playback of music and volume from the middle section
You can enable Airdrop to send pictures, videos and other stuff to a device nearby
Enable AirPlay to send audio or video to your Apple TV, Airport Express or other AirPlay devices.
On the bottom you can enable your flashlight, set an alarm and open the Calculator and the Camera app.