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+# Introduction
+
+## What is Docker?
+
+* Docker carves upa computer (linux) into sealed containers that run your code
+* Containers are designed to be portable, to and from your computer
+* Docker also builds these containers for you
+* Docker is social platform that share and find containers
+* Docker is not VM.
+
+### What is a Container?
+
+* A self-contained sealed unit of software
+* Contains everything required to run the code
+* included Code, Configs, Processes, Networking, Dependencies, enough Linux OS
+
+Docker is program that manage these containers
+
+### About Docker
+
+* A client program, that named Docker
+* A server program that manages a Linux system
+* A program that build containers
+* A service that distributes containers
+* Company that create this software also named docker
+
+## Using the exercise files
+
+`reformat.sh` in `Ex_Files_Learning_Docker_Upd` dir is for formatting the output using specialized environment variable