RSS (Really Simple Syndication) is an XML format for web content syndication that allows users to read headlines and other content from multiple sources. It can be used to syndicate blog posts, newsletters, weather alerts, press releases, special offers, calendars, and more. RSS feeds provide an opt-in way for users to receive updated content from sites they choose in a standardized format. Almost any type of web content can be syndicated using RSS by placing it in an "enclosure" that provides a link to download the content. RSS feeds can be created using a text editor or web tools and displayed on websites to notify users that an RSS feed is available.