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Docker is a platform for distributed applications for developers and
system administrators that allows running applications in containers. It
enables you to use specific software, such as Redis or MongoDB, or a
specific version of software, which might not be supported by your
operating system or might need compiling.
Docker is available as a Plesk extension. Plesk allows you to run and
manage containers that are based on specific Docker images, and to use
Docker not only on the local host, but also on the specified remote
machine.