RSS (Really Simple Syndication) is an XML-based format used for publishing news or articles in a machine-readable form. An RSS or Atom file is also called a feed. A program that can be used to read such feeds is called a feed reader or aggregator, hence the title of the application, Akregator.
Akregator automatically extracts new items from the feed and displays them in a human-friendly form to the user. The user can therefore save time with regularly-visited websites, as they need no longer manually check whether there are new pieces of information available.
RSS is available in different versions which are not compatible with each other (this situation caused by competing companies): RSS 0.9, RSS 1.0 and RSS 2.0. Atom is also an XML-based feed language which has been redesigned to fit the needs of webloggers and news sites. Atom attempts to replace RSS feeds and remove the uncertainty with incompatibilities in the different RSS versions.