Docker container & its advantages.

A docker container is an isolated process or a unit created on the fly to hold the services/applications. The docker container can share library of any OS like if using Ubuntu image then it’ll be an Ubuntu container, for Cent OS it’ll be creating a Cent OS container. Also, it can be an encapsulation of an application image like Apache-php or php-mysql etc. 

Also, launching a container uses very less resources in comparison to VM’s and launch time is very less (approx. milliseconds).