Simple Storage Service
Simple Storage Service (S3) is used to store objects in the cloud. S3 can scale to enormous size. You can store an unlimited number of objects and access them from anywhere. You access S3 over HTTP or HTTPS using a REST API. This is the same service Amazon uses to store data for its web site!
S3 provides an unprecedented 99.999999999% (that’s 11 nines) durability by storing data multiple times across multiple availability zones within a region. A single object can be anywhere from 1 byte to 5 terabytes and you can store an unlimited number of objects.
Unlike Elastic Block Storage you cannot attach S3 storage ...