AWS S3 Storage Mastery

Amazon S3 (Simple Storage Service) is the foundational object storage service in AWS. Unlike databases (which store structured data) or block storage (which acts like a hard drive), S3 stores files as objects—any type of data file: images, videos, logs, JSON, PDFs, backups, datasets. S3 is infinitely scalable, durable (99.999999999% durability), and cheap. It powers data lakes at Facebook/Netflix, CDN backends, backup systems, and any application that needs to store files at scale. In 2026, S3 is not a "cloud storage" service you might use to store your photos—it's infrastructure. It's how Uber stores ride logs, how Stripe stores receipts, how Databricks stores data lake partitions. Mastery of S3 is mandatory for cloud architects, backend engineers, and data engineers.