Like the others said it is used to break up outline and shades, which helps conceal you and movements. Now in Saskatchewan it is illegal to use camo in an open big game rifle season, it is only allowed in Archery and Muzzleloading seasons. So I were both solid colour and camo clothing in a given year. The key to any concealment is backing and use the lay of the land to help conceal you and your movements. While camo talkes it another notch higher, it will not help a hill of beans if you don' t use it in the most advantageous way.