RSS (Really Simple Syndication) allows users to subscribe to frequently updated content like news headlines and blog posts. When a site publishes new content, RSS feeds deliver brief summaries to subscribers without them having to manually check the site. RSS feeds are automatically detected and displayed by most web browsers and can be read through an RSS aggregator, which compiles feeds from multiple sites in a single location. This allows users to easily keep up with updates from their favorite news sources and blogs from any internet-connected device.