What is the service used to create virtual machines that are quick to boot and easy to manage?

The service utilized to create virtual machines that are quick to boot and easy to manage is often represented by the concept of "Amazon Machine Images" (AMIs). These are pre-configured templates provided by Amazon Web Services (AWS) that contain the operating system, software, and settings necessary to launch a virtual server within Amazon's Elastic Compute Cloud (EC2). AMIs can be used to quickly spin up instances, allowing users to deploy virtual machines rapidly, which is particularly important in cloud environments where scalability and speed are essential.

AMIs also facilitate easier management due to their standardization and integration with AWS services. Users can create their own AMIs from existing instances, customize them as needed, and share them with other users or utilize them for scaling applications. This makes the process of launching and managing virtual machines streamlined and efficient.

Other options, while related to virtualization and containerization, do not match the specific requirement of creating virtual machines in the same context as AMIs. For instance, Docker containers are designed for application deployment in isolated environments but are not classified as traditional virtual machines. Thus, Amazon Machine Images stands out as the most relevant and correct choice for this description.