Why does the join method in python return keys only when used on a dict?

Question

myFriend = {"name": "Peter", "age": "16"}

x = ', '.join(myFriend)

print(x)

Answer 1

Såñtösh Màràvi thank you but not clear. I mean I still don't get it

Answer 2

Because key are only print in immutable order but values doesn't .
That's why it join only key's .