Superman is an alien (Kryptonian) who was sent to Earth by his parents (Jor-El and Lara) before Krypton was destroyed.
His Kryptonian name is Kal-El and to the world he is Superman, but is also known as The Last Son of Krypton, The Man of Steel and The Man of Tomorrow. His alter-ego is Clark Kent; a journalist for the Daily Planet. His wife is Lois Lane who is also a Daily Planet journalist.
Raised by Jonathan and Martha Kent in Smallville, Clark was taught the difference between right and wrong from a young age and grew up with strong values and morals.
Under a yellow sun Clark developed abilities that would continue to grow as he matured. Superman is one of the world's greatest super heroes and with his various abilities it's not hard to see why.
Some of Superman's powers include: Flight, Super Strength, Super Speed, Invulnerability, Regeneration, Heat Vision, X-Ray Vision, Freeze Breath, and Super Hearing. Superman is one of the most powerful super heroes of all time but he does have some weaknesses like any hero does.
Some of these weaknesses are: kryptonite (radioactive remains of Krypton), magic, extreme amounts of force/impact from even more powerful beings than himself and if exposed to a red sun he will lose all Kryptonian powers.