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Aggregators reduce the time and effort needed to regularly check websites for updates, creating a unique information space or "personal newspaper." Once subscribed to a feed, an aggregator is able to check for new content at user-determined intervals and retrieve the update. The content is sometimes described as being "pulled" to the subscriber, as opposed to "pushed" with email or IM. Unlike recipients of some "pushed" information, the aggregator

RSS is a family of web feed formats used to publish frequently updated digital content, such as blogs, news feeds or podcasts. Users of RSS content use programs called feed "readers" or "aggregators": the user subscribes to a feed by supplying to his or her reader a link to the feed; the reader can then check the user's subscribed feeds to see if any of those feeds have new content since the last time it checked, and if so, retrieve that content and present it to the user. The initials "RSS" are variously used to refer to the following standards: Really Simple Syndication (RSS 2.0) Rich Site Summary (RSS 0.91, RSS 1.0) RDF Site Summary (RSS 0.9 and 1.0) RSS formats are specified in XML (a generic specification for data formats). RSS delivers its information as an XML file called an "RSS feed," "webfeed," "RSS stream," or "RSS channel".