Superman is also called the Man of Steel. In fact, one of the most recent Superman movies is “Man of Steel,” which came out in 2013 starring Henry Cavill as the Man of Steel.
This is one of Superman’s nicknames because he’s pretty darn invincible. I mean, think about it. He’s bulletproof. No typical human weapon can really hurt him. Kryptonite is his open secret; it’s the only thing that can really do some damage.
All in all, Superman has some pretty super powers. (See what I did there?) He is able to take anything the world throws at him as Clark Kent, and then some as Superman. Since he is the Man of Steel, he can save earth while destroying half a city block in the process and still live to report on it the next day.