Amazon Web Services
Amazon Web Services (AWS) is a commercial cloud computing offering that follows the infrastructure as a service (IAAS) model. It is based on virtual machines that are used to flexible share computing and storage resources in a safe manner. The payments are based on a pay-as-you-go Approach for pricing of over 70 cloud services. That means that AWS typically charges by the hour for the number of virtual machine instances that are used. This is also true when the machines are idle and thus not used. The idea beyond this is quick scalability in response to tough load variation given by end users. So an application can scale up and down in order to save money.
AWS Cloud Architecture
The AWS architecture consists of many building blocks based on various products that users can individually put together in a very flexible manner to create their applications. The Elastic Computing Cloud (EC2) offers virtualized platforms to host VMs where cloud applications are running. The Simple Storage Service (S3) offers an object-oriented storage service for AWS users. The Elastic Block Service (EBS) provides block storage in order to support more traditional applications. The Elastic File System (EFS) provides a simple and scalable file storage to be used by EC2 instances within the AWS cloud architecture. Amazon DevPay is a simple online billing and account management service that makes it easy for businesses to sell applications that are built on the AWS cloud infrastructure. But this cloud service is gradually replaces by the new emerging approach of the AWS Marketplace. The marketplace is an online store that makes it easy for AWS customers to find, compare, and immediately start using Services that they Need in order to build applications and to run their business ideas. More details can be found on the official Web page.
More about Amazon Web Services
The following video provides more details: