What is Docker?
Docker is a containerization software that is used for automating the deployment and management of applications within an isolated environment. This software allows us to "pack" and ship an application, along with all of its needed files, libraries, and dependencies, into a "docker container". That container can then be easily ported to any Linux system that contain cgroups support within the kernel, and provides a container management environment. Docker is one of several containerization implementations (not to be confused with virtualization) based on this cgroups mechanisms built into the Linux kernel.