Docker is a toolkit for creating, running and shipping containers and images on Linux system.
Docker image is a filesystem snapshot, packed version of all files required to run some process (application).
Docker container is a process (application) which executes from files and environment packed into docker image
Docker is not a VM, it shares Linux kernel with other processes. It's just a restricted environment for execution of a process.
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Docker is a toolkit for creating, running and shipping containers and images on Linux system.
Docker image is a filesystem snapshot, packed version of all files required to run some process (application).
Docker container is a process (application) which executes from files and environment packed into docker image
Docker is not a VM, it shares Linux kernel with other processes. It's just a restricted environment for execution of a process.