The folder's location varies depending on the operating system and how the SDK was installed: SDK Platform Tools release notes | Android Studio
You can obtain the folder either as a standalone package or as part of the full Android Studio installation. How to setup ADB & fastboot to be used anywhere on Windows platform tools folder
A versatile tool that manages the state of an emulator or connected Android device. It is used to install APKs, pull/push files, and run shell commands. The folder's location varies depending on the operating