RSS subpage

[K.]

Hello!

I would like to know more about RSS.
I have read on wikipedia that RSS subpage needs to be read by some RSS
reader applications.
So can you tell me how RSS web subpage should technically look like and what
things I should
implemenet to make my RSS subpage read by RSS reader applications?
The only thing I know is that subpage should be right XML formatted.
What more?

Thank you in advance
M.