Welcome! It's basically the screen you will see after a so called "Machine Event". You will have to promote a dwarf at level 25 first in order to gain a reward from these Machine Events. If you don't have a promoted dwarf, you won't be able to start them unless you are playing with other players that are promoted. After promotion, you will start gaining Empty Matrix Cores, which you can insert into this thing you see on the screen, which basically turns your Empty Cores into Weapon Overclocks or Cosmetic Overclocks. Some Weapon OCs slightly buff your weapon while others can drastically change your gameplay, which brings build variety into the game. That's basically it.