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Docker fundamentals

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Nowadays everybody is talking about Docker. Some people are well versed with docker concepts and have hands on it and some have started learning docker. So what is Docker?. As per the official docs from docker, Docker is a platform for developers and sysadmins to develop , deploy , and run applications with containers. So what does make it different. We were already doing that since long . When we are deploying application on servers we have to deal with setting up new VM , configuring dependencies / libraries, environment variables. Docker makes this thing easy for you, by providing OS level virtualization (aka. containerization). So basically you can create Docker images that will have all your resources ( env. variables / libs / running on what port). Then you can deploy your application inside docker container anywhere without even worrying about the dependencies. In traditional way you have to setup separate VM and then install all the required software and have