What Is The Difference Between Javascript And Rss?

I want to start a feed on my page. On the website I go to, there is an option for both javascript and rss, and I have no idea what the difference is?

COMPENSATION DISCLOSURE: Site owner receives compensation for some or all products on this site.

Contact | Disclaimers and terms of use | Privacy policy | RSS | Powered by Yahoo! Answers.
RSS Marketing - Really simple syndication, RSS aggregators, create simple RSS feed, basic RSS feed