What is Docker?
Docker refers to open-source software for container virtualization and is also a term for the entire ecosystem surrounding this technology.
Container virtualization allows multiple operating systems and applications to run in isolated environments (so-called containers) on the same computer.
Docker is an open-source software platform with an ecosystem of related tools for creating, deploying, and managing virtualized application containers on a common operating system (OS). this technology debuted in 2013 i.e., Docker Inc. was formed to support a commercial version of container management software and to be a major sponsor of an open-source version. It is an open-source containerization platform that enables developers to package applications in containers - standardized executable components that link application source code with the operating system (OS) libraries and dependencies needed to run that code in any given environment.