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 QA 1: What is Docker? Docker is built on the PASS model, which gives privileges to developers to deploy multiple applications in different containers, and allocates the defined disk space, and network. Docker made the build process easy, for which we can set up an application in less time. QA 2: What is Container?