🇻🇳 This article is also available in Vietnamese: iOS là gì?

iOS is a mobile operating system developed by Apple Inc. for its mobile devices. As Apple describes it, "both the iPod touch and the iPad are iOS devices." It serves the same purpose as Android OS, but runs only on Apple hardware.

To run iOS applications on an emulator, you need a Mac running macOS (formerly Mac OS X), just as developing for Android is commonly done on Ubuntu or another Linux system. Once macOS is set up, you install the iOS development tools on it and use the emulator (the iOS Simulator in Xcode) to study and test iOS apps.