Swipe up from the bottom of your screen to the top. If you get All Apps , tap it. Tap the app that you want to open.

Swipe up on the app you want to kill, as if you were throwing it off the screen. This works if your apps are listed horizontally. Or, for vertically listed apps, swipe the app left or right to close it immediately.

If you have a newer Android phone, swipe up from the bottom-right corner of the screen. If your phone has physical navigation buttons, press the square app switcher button next to the home button. There may also be an icon with three vertical lines to access the app switcher.