Unlocks the bootloader (varies by manufacturer; on Pixels it's fastboot flashing unlock ).
Minimal ADB and Fastboot v1.4.3 Portable is a lightweight, simplified version of the Android SDK platform tools. Originally created by shimp208 at XDA-Developers, it allows you to send commands from your Windows PC to your Android device without installing the full, multi-gigabyte Android Studio package. Key Features Small Footprint: minimal adb fastboot v143 portable