YouTube is Google's online video service. With it you can upload your own videos or watch any of the millions and millions of videos — from cats on pianos to the latest Hollywood trailers and to independent movies and TV shows — uploaded by people around the world. While you can view YouTube in the built-in Safari web browser, Google also offers dedicated YouTube apps for both iPhone and iPad that provide extra features and functionality.

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YouTube was one of the default apps on the iPhone and iPad up until iOS 6 but when Apple and Google couldn't come to terms over advertising — Apple didn't want it in the built-in app — they parted ways and YouTube went to the App Store. (YouTube remains a default app on the Apple TV, however.)

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