AWS S3
Amazon's fully managed object storage service — the origin and reference implementation of the S3 API. As of December 2025, the maximum object size is 50 TB (up from 5 TB).
Summary
Amazon's fully managed object storage service — the origin and reference implementation of the S3 API. As of December 2025, the maximum object size is 50 TB (up from 5 TB).
AWS S3 is the gravitational center of the ecosystem. It defined the API that became the de-facto standard, and most tools in this index were built to work with AWS S3 first and other providers second. The 50 TB object limit shift means massive AI training datasets and 8K video can now be stored as single atomic objects rather than complex multi-part sequences.
- AWS S3 is now strongly consistent (read-after-write), but code written against the old eventual consistency model may still contain unnecessary workarounds.
- S3 storage is cheap; S3 API calls and egress are not. Cost optimization requires understanding request pricing and transfer charges, not just storage GB.
- The 50 TB limit applies to individual objects; existing tooling that splits datasets at the old 5 TB boundary may need updating.
implementsS3 API — the reference implementation of the standardenablesLakehouse Architecture — provides the storage layer for lakehousesenablesSeparation of Storage and Compute — foundational to the patternused_byMedallion Architecture — each layer stores data on S3constrained_byObject Listing Performance, Lack of Atomic Rename, Egress Cost — key operational limitations
Definition
Amazon's fully managed object storage service. The original implementation that defined the S3 API and established object storage as a category. As of December 2025, supports individual objects up to 50 TB (increased from 5 TB), enabling massive AI training datasets and high-resolution media to be stored as single atomic objects.
To provide scalable, durable, low-cost storage accessible over HTTP, decoupled from any specific compute or filesystem.
Data lake storage, static asset hosting, backup and archival, analytics data staging, ML training data storage, large-object AI dataset ingest (50 TB single-object).
Connections 11
Outbound 9
scoped_to2implements1used_by1constrained_by3Inbound 2
indexes1depends_on1Resources 4
The canonical entry point for all official Amazon S3 documentation, covering every API, feature, and configuration option.
The S3 REST API reference is the foundation that every S3-compatible system implements against; this is the de facto S3 protocol spec.
Official product page with feature overview, pricing, storage classes, and customer stories.
AWS's official storage blog announces new S3 features, best practices, and architectural guidance from the team that builds S3.