Docker is an open-source platform for developing and running applications inside packages called containers. These containers include everything that an application needs to run, like operating system, application code, runtime, system libraries, system tools, etc. Docker simplifies the process of building, running, managing, and distributing containerized applications. This book offers realistic mock tests and sample papers for the DCA Exam which are arranged according to their domains as provided below. This sample questions mimic the actual DCA Exam. The DCA Domains Orchestration - 25%Image Creation, Management, and Registry - 20%Installation and Configuration - 15%Networking - 15%Security - 15%Storage and Volumes - 10%Get DCA certified on your 1st attempt. All the very best.