What does Amazon S3 actually do?

Amazon S3 is a cloud-based object storage service that allows users to store and retrieve any amount of data, from anywhere on the web, through a simple web services interface. It's designed to be highly scalable, secure, and durable.

Has the S3 API changed over 20 years?

No, Amazon S3 has maintained complete API backward compatibility for 20 years. This means applications built on the S3 API in 2006 should still work today without modifications.

Is S3 storage expensive?

While pricing varies by region and storage class, S3's pricing has decreased significantly since its launch. For example, the cost per gigabyte has dropped by approximately 85% since 2006. Additionally, features like S3 Intelligent-Tiering help optimize costs further.

☁️ Cloud & Infrastructure

Amazon S3 at 20: Beyond the API, a Foundational Shift

Twenty years ago, Amazon S3 launched with little fanfare, offering just a paragraph of explanation. Today, it's the bedrock of the internet's data, storing exabytes and serving millions of requests per second.

Dev Digest Apr 13, 2026 4 min read

A visual representation of data flowing through interconnected servers, symbolizing the vastness and complexity of Amazon S3.

⚡ Key Takeaways

S3's enduring success stems from its foundational architectural philosophy: provide simple, reliable building blocks for developers. 𝕏
Despite massive growth in scale and object size, S3 has maintained absolute API backward compatibility for 20 years. 𝕏
Continuous engineering innovation, particularly in data integrity and microservices, underpins S3's extreme durability and availability. 𝕏
The S3 API has become an industry standard, influencing countless other storage solutions and simplifying developer workflows across the ecosystem. 𝕏