What is the difference between cake flour and regular flour?

Cake flour has less gluten in it. Gluten is in wheat flour. It is what gives bread it's texture and structure. cake flour is a soft summer wheat as is pastry flour regular flour and bread flours are a winter wheat a lot more gluten Cake flour is softer and more refined than all purpose flour, if the recipe calls for cake flour then do not substitute for if you do the results will not be the same.