Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now 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 +