What are the differences between sponge cake and regular cake in terms of texture, taste, and ingredients used?

Sponge cake is lighter and airier in texture compared to regular cake, which is denser and more moist. Sponge cake has a subtle, delicate taste, while regular cake is richer and sweeter. The main difference in ingredients is that sponge cake typically uses a higher proportion of eggs to flour, while regular cake includes more butter and sugar.