There are four types of sponge cake - genoise, joconde, biscuit, and savarin.
Genoise is the most popular type of sponge cake. It is made with eggs, sugar, flour, and butter. The batter is beaten until it is light and airy, and then baked in a cake pan.
Joconde is a French sponge cake that is similar to genoise. It is made with eggs, sugar, almond flour, and butter. The batter is beaten until it is light and airy, and then baked in a cake pan.
Biscuit is an Italian sponge cake that is made with eggs, sugar, flour, and baking powder. The batter is beaten until it is light and airy, and then baked in a cake pan.
Savarin is a sponge cake that is soaked in syrup. It is made with eggs, sugar, flour, yeast, and butter. The batter is beaten until it is light and airy, and then baked in a cake pan.