Apple is perhaps most famous for its mobile devices, which are small computers that are easy to carry around. They have touchscreens with multi-touch technology instead of a separate keyboard and mouse. Most of these products run an operating system called iOS. It is very similar to the Android software made by Google. iOS can do a lot of different things, and it does so by running "apps", which are programs similar to those on a PC. Users can download and buy more apps for their device from Apple's App Store.