What is Amazon S3?

Amazon Simple Storage Service (S3) is an object storage service offering virtually unlimited storage. Data is stored as objects in buckets. Each object can be up to 5 TB. S3 provides 99.999999999% (11 nines) durability. Storage classes include S3 Standard (frequent access), S3 Infrequent Access, S3 Glacier (archival), and S3 Glacier Deep Archive (long-term archive at lowest cost).