When you look at the YAML after you've deployed in kubernetes, surprisingly (from a novice perspective), there's a bunch of unknown code in addition.
In fact, it is essential to work properly, and moreover, it almost matches in best practice way to work for highly compatible purpose.
For example, the service has a key value called "sessionAffinity". This value is set to "None" by default.
We could replace it with a value called "ClientIP" instead of None, but this needs to be carefully considered to avoid side effects.
So in this session it is important to understand the implications of having such a default value in there, and being able to do so will help us when we study each of these objects in more detail in the future.
I'm sure you'll find it useful and thought provoking! :)