RSSRSS /ˌɑːr es ˈes/ noun [uncountable] 
(Rich Site Summary or Really Simple Syndication) software that tells an Internet user when a website has new information on it: 
Our free RSS feeds include headlines and news summaries.
(Rich Site Summary or Really Simple Syndication) software that tells an Internet user when a website has new information on it: Our free RSS feeds include headlines and news summaries.