What Ingredient Adds Fluffiness In Cakes?

I've heard its the eggs, maybe more egg yolks? Or egg whites? Or is it the baking powder? Whatever the main ingredient is that help fluff the cake, what would adding too much do? By the way, what I mean by fluffy is the airy ness of the cake in need losing moisture.


Answer:
I do believe it's the baking powder
In the cakes, It's the baking powder. But in bread , It's Yeats

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