Iron Man is a superhero found in the Marvel Universe. His real name is Anthony "Tony" Stark.
Tony Stark is an Industrialist, Inventor and Scientist. His mind ranks with other genius Superheroes such as Hank "Yellowjacket" Pym and Reed "Mr. Fantastic" Richards. When Tony was younger, he was doing his patriotic duty of supplying foreign nations with arms. However his weapons fell, sadly, into the wrong hands. Amidst the quagmire, none of which was his intention, he was wounded. His body was found by a local doctor known as Ho Yinsen. Yinsen repaired him the best he could. However shrapnel drew ever nearer to his heart and threatened his life, so Ho constructed a vest which would use an electromagnet to halt the shrapnel's progression. Tony would be confined to it for the rest of his life.
Ho Yinsen and Tony worked together, combining their genius, and found a way to make the vest more portable. An Iron Man armor was constructed. Gray and dull, clunky, but with massive offensive capabilities. However, before the suit was completed Ho Yinsen found himself between Stark and the rebels who had incapacitated him. Yinsen bravely gave his life so Iron Man could live.
Stark was forever grateful and decided in repentance for Yinsen's sacrifice he would be vigilant in continuing his fight against tyranny and evil.
Tony Stark is not, however, without his own flaws. He did spend some time as an alcoholic. But with the help of his friends, like Captain America, Thor and Giant Man, he got through it. Because of this, he has been indebted to them for the rest of his life.