What is an RSS feed ?

Whether we call it "RSS feed" ("Rich Site Summary" or "Really Simple Syndication"), "RSS channel", "RSS thread", "information thread", the principle remains the same: it is a data format to disseminate updates of websites whose contents change very often (information websites, blogs...).
An RSS feed gives a summary of the latest information on a website: generally a title, a very brief description and a link to the original page with the information.
The RSS file is updated constantly: it contains all the latest published information.