An Amazon EC2 instance is a virtual server in Amazon's Elastic Compute Cloud (EC2) for running applications on the Amazon Web Services (AWS) infrastructure. AWS is a comprehensive, evolving cloud computing platform; EC2 is a service that enables business subscribers to run application programs in the computing environment. It can serve as a practically unlimited set of virtual machines (VMs).
Amazon provides various types of instances with different configurations of CPU, memory, storage and networking resources to suit user needs. Each type is available in various sizes to address specific workload requirements.
Instances are created from Amazon Machine Images (AMI). The machine images are like templates. They are configured with an operating system (OS) and other software, which determine the user's operating environment. Users can select an AMI provided by AWS, the user community or through the AWS Marketplace. Users also can create their own AMIs and share them.
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