Is it true that a field is a vector space over a field?
This idea arises in me after reading the solution for the question the order of finite field is $p^n$.
I am wondering if it is possible to not consider subfield but just a field as a vector space over a field.
In fact, I don't quite get why a field is a vector space over its subfield. Why can't it be other fields?
I am having a lot of confusion here.