What does it mean to "fold" in culinary terms?

In culinary terms, "folding" refers to the technique of gently combining a light mixture, such as whipped cream or beaten egg whites, into a heavier mixture, such as cake batter or a custard. This method is important because it retains the airiness and volume of the lighter mixture, preventing it from collapsing due to vigorous mixing. The process typically involves using a spatula or a similar tool to lift and turn the mixtures over each other rather than stirring, which can deflate the air bubbles that provide lightness and texture in baked goods.

The context of this answer highlights the importance of technique in baking and cooking, where maintaining the structure and texture of mixtures can significantly impact the final outcome of a dish.