What is a Docker? Docker is a technology that allows us to run the self-contained applications without worries about dependencies and libraries. It follows the concept of containerization. Then what is a container? A container is an is an abstraction at the app layer and is a lightweight, stand-alone, executable package of a piece of software that includes everything needed to run it: code, dependencies , system libraries, settings etc.
Docker containers are light weight because while running on a single machine it shares that machine’s operating system kernel; they start instantly and use less compute and RAM. It isolate applications from one another and limit app issues to a single container instead of the entire machine. When an app is dockerized, that complexity is pushed into containers that are easily built, shared and run. While using docker we neither have to worry about the installation and configuring complex databases nor about switching between incompatible language tool versions. Docker can be used to run the code on our laptop in the same environment as we have on our server. So it is a very interesting, easy and useful technology in the present era. You can see the graph of adoption of docker.
If you want to know more about the internal working and want to set up you docker you can clickhere.