Sudo (sometimes considered as short for S uper- u ser do ) is a program designed to let system administrators allow some users to execute some commands as root (or another user). The basic philosophy is to give as few privileges as possible but still allow people to get their work done.
The example in the video proceeding it used cat, why would we be expected to use vi all of a sudden? Also an explanation of why cat doesn’t work in this instance would be helpful, instead of flip response.