Control Center gives you instant access to the camera, calculator, AirPlay, control and playback of currently playing audio, and other handy features. You can also adjust the brightness, lock the screen in portrait orientation, turn wireless services on or off, and turn on AirDrop. 

Control Center screen. In the top row are the Airplane mode, Wi-Fi, Bluetooth, Do Not Disturb, and Portrait orientation lock buttons. Below that is the screen brightness control. Below that is Now Playing info with audio playback controls. Below that are the AirDrop and AirPlay buttons. At the bottom are the flashlight, clock, calculator, and camera buttons

Open Control Center. Swipe up from the bottom edge of any screen (even the Lock screen).

Open the currently playing audio app. Tap the song title.

Close Control Center. Swipe down, tap the top of the screen, or press the Home button.

Turn off access to Control Center in apps or on the Lock screen. Go to Settings > Control Center.