RSS - Wikipedia
https://en.wikipedia.org/wiki/RSS
RSS (RDF Site Summary or Really Simple Syndication) is a web feed that allows users and applications to access updates to websites in a standardized, computer-readable format. These feeds can, for example, allow a user to keep track of many different websites in a single news aggregator.
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Finally, follow websites via RSS feeds the way you want to. Simply enter the URL of the website you would like to get a feed from. Most websites and social networks supported.