RSS allows users to aggregate headlines and content from multiple websites into a single feed that can be easily viewed and monitored. It works by websites publishing content updates in RSS format, which are plain text files that use XML tags to describe things like titles, dates, and URLs. RSS readers then collect these updates from across the web and display them together for the user to review quickly without visiting each individual site. Creating RSS feeds is similar to building a regular website, with the content and design controlled by XML tags that readers can interpret to display the feed.