Difference between kickboxing and muay thai?

Muay Thai is a traditional martial art which is practiced in several Southeast Asian countries. It utilizes kicks and punches, but unlike kickboxing, it also utilizes knee and elbow strikes. This makes it completely different because the most important and common moves of Muay Thai are based on knee and elbow strikes. This is one reason that the art is also known as the "art of eight limbs"