Mobile emulators are software applications that mimic the functionality of mobile devices on a computer. They allow developers to test and debug mobile applications without needing a physical device. By simulating various operating systems, screen sizes, and hardware configurations, emulators help ensure that apps perform well across different environments. These tools are essential for app development, as they provide a cost-effective way to identify issues early in the process. Popular mobile emulators include Android Studio for Android apps and Xcode for iOS apps. Using emulators can significantly speed up the development cycle and improve app quality.