This is a frequently asked question in Flutter interview questions.  Debug Mode: The Debug mode in Flutter is used to debug the physical device, emulator, or Simulator. In this mode assertions and service extensions are enabled. The Compilation process is optimized for fast deployment. This process is enabled, and tools supporting source-level debugging can connect to the process. In the debug mode, Flutter optimizes the app to reflect changes faster.  Profile Mode: The Profile Mode in Flutter is used to analyze the performance of our app. Here, some extensions and tracing are enabled. The Profile mode is disabled on the emulator and simulator because their behavior is not representative of real performance.  Release Mode: The Release mode in Flutter is enabled to deploy our app. Here, assertions, service extensions, and debugging are disabled. The compilation process is optimized for fast startup, execution, and package sizes. This mode is used to deploy the app when we want maximum optimization and minimal footprint size. It is designed to get our app ready for the Play Store and App Store.