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RSS is a way for website authors to publish notifications of new content on their website. This content may include newscasts, blog posts, weather reports, and podcasts.
I was confused—RSS hasn't disappeared. I use it every single day. It's an integral part of my workflow that helps me stay up to date with news, come up with new ideas for content, gather sources to cite in my posts, and keep my inbox clean. But the 300+ likes on this post and a subsequent Twitter search for "bring back RSS" that resulted in dozens of Tweets showed me that RSS is underutilized.
An RSS (Really Simple Syndication) feed is an online file that contains details about every piece of content a site has published. Each time a site publishes a new piece of content, details about that content—including the full-text of the content or a summary, publication date, author, link, etc.—are automatically generated in the file and displayed in reverse chronological order.
Since it's updated with details about every piece of content a site publishes, you can use RSS feeds for things like keeping up to date with every new article your favorite blog publishes or automatically generating email newsletters or social media posts to promote your new content.