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 1.What is Docker – in 2 lines Ans: A platform for building, running and shipping applications. 2. What is Container – in 3 lines Ans: A Docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools , system libraries and settings.