Lesson Summary: A stateful application is anyone that stores data or application state so that it can be accessed after the user's session is over. Obviously, a great many apps fall into this category. However, Kubernetes Engine, by default, is set up for stateless apps—so does that mean stateful apps are out-of-reach? Absolutely not! In this video, I'll show you all the necessary steps for creating a persistent disk so you can incorporate both stateless and stateful apps on Kubernetes Engine.