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A Container Engine is a piece of software that accepts user requests, including command line options, pulls images, and from the end user’s perspective runs the container. There are many container engines, including docker, RKT, CRI-O, and LXD. Also, many cloud providers, Platforms as a Service (PaaS), and Container Platforms have their own built-in container engines which consume Docker or OCI compliant Container Images. Having an industry standard Container Image Format allows interoperability between all of these different platforms.

Source: https://developers.redhat.com/blog/2018/02/22/container-terminology-practical-introduction/