Какво е хуск и защо е полезен?

https://farmhopping.com/b/blog/2016/12/18/%d0%ba%d0%b0%d0%ba%d0%b2%d0%be-%d0%b5-%d1%85%d1%83%d1%81%d0%ba-%d0%b8-%d0%b7%d0%b0%d1%89%d0%be-%d0%b5-%d0%bf%d0%be%d0%bb%d0%b5%d0%b7%d0%b5%d0%bd/