The Adafruit Metro 328 is at its core an ATmega328 microcontroller. It's based on the Arduino Uno Rev3 model. These devices are programmable and open-source. If you're looking to jump into programming and learn more they are a great way to practice and see your actions come to life.
This repo is for sample and practice projects, such as those found in the Experimentation Kit for Metro 328.
Product Page: https://www.adafruit.com/product/3588
More information can be found at the official Adafruit website: https://www.adafruit.com