Glycemic Index Help - What is the difference between Glycemic Index and Glycemic Load?

What is the difference between Glycemic Index and Glycemic Load?

GLYCEMIC INDEX: a system that ranks foods by the speeds at which their carbohydrates are converted into glucose in the body; a measure of the effects of foods on blood-sugar levels. GLYCEMIC LOAD: The glycemic load (GL) is a ranking system for carbohydrate content in food portions based on their glycemic index (GI) and the portion size.