[jeffbarr]

An object is a single blob of data. S3 objects vary in size from 1 byte up to 5 Terabytes. They can be uploaded with a single PUT, or with multiple PUTs in series or in parallel (which we call multipart upload). They can be downloaded as a unit, in full (GET) or in part (range GET).

[raulonkar]

Thanks jeffbarr for valuable information...

[Udo]

Which you could have googled in 3 seconds.