Object storage service

Designed for 11 nines of durability

Standard, IA, One Zone IA, Glacier, Glacier Deep Archive

Use IAM policies or bucket policies

Can host static websites directly from a bucket

Read-after-write for new objects in PUTs

SSE-S3, SSE-KMS, SSE-C or client-side

Recommended for files over 100MB

Automatic transition between classes or expiration

Trigger Lambda, SNS, or SQS on changes

Preserve, retrieve and restore every version

S3 is a global service with buckets in regions