In Greek mythology who was the snake with heads?

In Greek mythology, the creature with many heads is known as the Hydra. It was a serpent-like monster that lived in the swamp of Lerna and had the ability to regenerate two heads for each one that was cut off. The Hydra was famously defeated by the hero Heracles (Hercules) as one of his Twelve Labors, where he had to find a way to prevent its heads from regrowing. This battle symbolized the struggle against seemingly insurmountable challenges.