What do we use vinegar in some cake recipes?

we do? omfg.vinegar??What do we use vinegar in some cake recipes?
sour-dough recipes,What do we use vinegar in some cake recipes?
it reacts with the other ingredients to make the cake raise. ex vinegar + baking soda
It reacts with ingredients like baking soda and buttermilk to produce a light, soft texture(gingerbread and Red Velvet cake are examples).