Victron Venus OS with MQTT sensors, switches and numbers

This all works really great. I was wondering what the purpose of the code below is? Do I have to include that? What does it do?

device: {
          identifiers: [
           "Victron Cerbo GX"
          ],
          manufacturer: "Victron Energy",
          model: "Cerbo GX",
          name: "Cerbo GX"}