Hello. Can someone tell me how Twitch works?

https://vip.twetch.app/t/63a753571126d2e921f8a94ae4977b427ca9873493faebe65700f8405c652642

Link broken, this is ok:
https://twetch.app/t/63a753571126d2e921f8a94ae4977b427ca9873493faebe65700f8405c652642