Achilles
In short
Achilles was a legendary Greek hero and the greatest warrior of the Trojan War. He is most famous for having a single weak spot on his heel.
In plain words
In ancient Greek myths, Achilles was a demigod with incredible strength and speed. His mother, a sea nymph named Thetis, dipped him into a magical river to make him invincible. However, she held him by his heel, so that part of his body never touched the water and remained vulnerable to injury.
A simple example
Imagine a superhero who is completely bulletproof everywhere except for one tiny spot on their ankle. If an enemy manages to hit that exact spot, the hero can be defeated.
Why it matters
His story is important because it introduced the idea of an 'Achilles' heel'. This term is now used in everyday English to describe a person's one specific weakness that can lead to their downfall.
Easy to mix up
People sometimes confuse Achilles with other Greek heroes like Hector or Odysseus. While they all fought in the same war, Achilles is specifically defined by his near-invincibility and his fatal weakness.