Android SDK Platform-Tools is a component for the Android SDK. It includes tools that interface with the Android platform, such as
systrace. These tools are required for Android app development. They’re also needed if you want to unlock your device bootloader and flash it with a new system image.
You no longer need to download and install the entire Android SDK or Android Studio and have Java JDK installed saving you something like 500 MB or even 1,7GB if you choose to download Studio and the burden of keeping Java up-to-date.
You can download the latest Platform Tools here:
https://dl.google.com/android/repository/platform-tools-latest-windows.zip https://dl.google.com/android/repository/platform-tools-latest-darwin.zip https://dl.google.com/android/repository/platform-tools-latest-linux.zip
The download is about 4 MB and you just need to unzip it somewhere.