A Cajon is a common instrument in South America. It is often related to flamenco music/ samba.But you can use it just as a real drum with a guitar for accompany. When you play the cajon, you are sitting on it an drumming with your hands on the front side of the drum. You can find out a whole technics and learning stuff if you just search on cajon drumming on youtube for example.
In this instructable I will tell you how I builded my Cajon!