What is Docker?

Docker is an open source project designed to help with application deployment using software containers. This approach means running applications together with the complete environment (files, code libraries, tools, and so on). Docker, therefore—similar to virtualization—allows an application to be packaged into an image that can be run everywhere.

Containerization versus virtualization

Without Docker, isolation and other benefits can be achieved with the use of hardware virtualization, often called virtual machines. The most popular solutions are VirtualBox, VMware, and parallels. A virtual machine emulates a computer architecture and provides the functionality of a physical computer. We can...