rss newbie

Guys,

bear with me on this one please, as this is simething I need to understand but don't know where to start.

I install a default Drupal site, I create content and promote and voila I have an RSS icon at the bottom of the front page allowing a someone to subscribe to the feed.

Alternatively I create new content types and implement Views to display said content and again voila I have optionally an icon at the bottom of the list (or whatever) which allows someone to subscribe to that subset of my sites data.