Amazon Web Services is a subsidiary of Amazon providing on-demand cloud computing platforms and APIs to individuals, companies, and governments, on a metered pay-as-you-go basis.
The AWS technology is implemented at server farms throughout the world and maintained by the Amazon subsidiary.
Fees are based on a combination of usage (known as a "Pay-as-you-go" model), hardware, operating system, software, or networking features chosen by the subscriber required availability, redundancy, security, and service options.
Subscribers can pay for a single virtual AWS computer, a dedicated physical computer, or clusters of either.
As part of the subscription agreement.