Fold
Folding is a gentle way to combine ingredients without decreasing volume, such as adding an ingredient to whipped egg whites or whipped cream. Folding is usually done with a rubber spatula, and a slow up and down motion.
Fun related videos

Learning to fold sugar during my Pastry Class at Oregon Culinary Institute

Cooking Tip: How to fold a Wrap. A Wrap Video from Tropical Smoothie Cafe.mov

How To Fold Ingredients For Baking

How to Whip and Fold in Egg Whites

Basic Cooking Tips And Techniques : Fold Eggs
Learning to fold sugar during my Pastry Class at Oregon Culinary Institute
Source: Artisan Cake Company
Cooking Tip: How to fold a Wrap. A Wrap Video from Tropical Smoothie Cafe.mov
Source: FrothyKick
How To Fold Ingredients For Baking
Source: holidaykitchen
How to Whip and Fold in Egg Whites
Source: The Culinary Institute of America
Basic Cooking Tips And Techniques : Fold Eggs
Source: expertvillage