The Android SDK is a set of tools that allows developers to create, test, and debug Android applications. It includes the following:
Android Debug Bridge (adb): This is a command-line tool that allows developers to communicate with devices running Android. It can be used to run commands, transfer files, and install and uninstall apps.
Android Emulator: This is a virtual device that runs on your computer. It allows you to test your app without having to use a real device.
Android Studio: This is the official IDE for developing Android apps. It includes all of the tools you need to build, test, and debug your app.