Wrought is an adjective that means "molded," "shaped," or "manufactured." A wrought-iron fence has been shaped to fit a particular ornamental style.
Wrought is most often used to describe the shaping, altering, molding, and manufacture of various metals, like iron, steel, aluminum. However, the word is actually related to wreak, which means "to cause damage." So we'll sometimes refer to the destruction wrought by a storm or some mad scientist like Dr. Frankenstein might lament the monster he has wrought with his hands.