What is Docker? Docker is a tool or platform to simultaneously run multiple applications or multiple instances of same application in a loosely isolated environment. What is Container? It’s a virtual machine which can be configured to run with single mount, NET, PID Map, User in isolated environment. Allocated with separate BOOT FILESYSTEMS + ROOT FILESYSTEMS + USER FILESYSTEMS + APP FILESYSTEMS which enables users to run applications/services independent of other containers while utilizing same resources. Benefit of Docker? Better