Steve Rogers is a fictional character from the Marvel Comics universe, best known as Captain America. He started as a frail young man during World War II who wanted to serve his country. After undergoing an experimental procedure, he gained superhuman strength and agility, becoming a symbol of hope and bravery. As Captain America, Steve wields a distinctive shield and fights against villains like Red Skull and Hydra. He embodies values such as courage, honor, and sacrifice, making him a beloved hero. His story highlights the importance of standing up for what is right, even in the face of overwhelming odds.