Explore the architectural foundations and engineering principles behind Amazon S3, one of the world's largest storage systems, in this 40-minute conference talk from AWS re:Invent 2025. Discover how S3 operates at massive scale, processing hundreds of millions of transactions per second across more than 100 data centers and tens of millions of drives while maintaining 99.99% availability and strong read-after-write consistency. Learn about the sophisticated design decisions and architectural strategies that enable S3 to gracefully handle constant failures at every level, from individual bits to entire buildings, ensuring data integrity and availability at unprecedented scale. Gain insights into the technical challenges and solutions involved in building and maintaining a storage infrastructure that serves millions of customers worldwide, from startups to large enterprises and government agencies.