Beginner (1-3)
Skis for beginners are easy to maneuver, and generally feature foam or composite cores that are more flexible and forgiving. This skier is cautious and prefers to stay on green terrain.
Intermediate (4-6)
Intermediate skis are designed to bridge the gap from beginner to advanced. This skier probably prefers a mix of green and blue terrain and will ski more aggressively as they become more confident.
Advanced (7-8)
Advanced skiers are those who can ski the whole mountain but don't prefer the most aggressive terrain for every run. Advanced skiers prefer a mix of blue and black terrain with the occasional run down extreme terrain.
Expert (9-10)
Expert skiers are extreme skiers who prefer high speeds and steep terrain all of the time. These skis are usually the stiffest and will often feature some sort of metal or carbon laminate making them more demanding.