Docker is operating-system-level virtualization

Docker containers OS are based on the local machine OS kernel. Unlike VM docker won't provide isolated OS. All containers share same kernel (Docker vs virtualization)

Docker makes it easier to create and deploy applications in an isolated environment.

A sandbox is a testing environment that isolates untested code changes and outright experimentation from the production environment or repository,[1] in the context of software development including Web development and revision control.

This project will be a Docker based sandbox which runs untrusted code and return the output to the user

The system will test the code in an isolated environment. This way you do not have to worry about untrusted code possibly damaging your server intentionally or unintentionally.

You can use this system to allow your users to compile their code right in the browser.

Docker Image = is a template to create many containers from that image

Docker container = running instance of the image (isolated and have their own environment)

Analogy = Image is like program and container is like process

Dockerfile = builds our own image based on instructions in it. We need to build an ubuntu based image for executing user code.