An Android Emulator is a software application that allows users to run the Android operating system on a computer. It mimics the hardware and software environment of an Android device, enabling users to test apps, play games, or explore the Android interface without needing a physical device. These emulators are commonly used by developers to debug and optimize their applications before releasing them on the Google Play Store. Popular examples of Android emulators include BlueStacks, NoxPlayer, and Android Studio's Emulator, each offering various features to enhance the user experience.