Usually, when an app freezes and becomes unresponsive, it will crash by itself, and not cause any other problem; depending on the type of app you were using, and on its type of functionality, a crash could mean that you lost some of your data for that app since it was last saved. In some cases, however rare, you may find yourself with a frozen application that won't go back to its normal state, and stay on screen, preventing you from using it or the rest of your iPad. As you'll learn in this tutorial, there are a couple of solutions for that problem, as well as a "brute force" extreme approach, which you'll likely never have to use, but is useful to keep in mind, just in case you ever need it. Since Apple filters all apps that make it to the App Store, you will not find too much bad quality software that cause that kind of problems (or not that often anyway).
Follow one of these series of steps to regain control of your iPad:
This is all you need to do to force quit a frozen application on your iPad; in extreme cases (which we've never encountered), if all fails, just leave your iPad unplugged and let its battery run down all the way, and restart it after that.