The document provides an explanation of RSS (Really Simple Syndication) in 5 parts. It defines RSS as a web protocol for sharing information from websites, similar to magazine subscriptions. It describes how RSS allows publishers to push content to many readers via feeds, and readers to pull aggregated content from multiple sources into a single location like Google Reader. The value of RSS is that it allows users to easily consume updates from many websites in one centralized place. The document concludes by demonstrating how to use RSS and Google Reader by finding RSS feeds on websites and subscribing to them.