It is a platform for service products that create a virtual container that contains a collection of software. A container is a collection of software, libraries, configured files that communicate with each other with well-defined channels. Docker Containers are standalone, executable packages, lightweight collection of software which just need to run for use. The major thing is open-source which is a software development solution which is known as containers.
The main purpose of Docker will let you run all the microservices with a distributed architecture.
Docker is a set of platform as a service products that use OS-level virtualization to deliver software in packages called containers. Containers are isolated from one another and bundle their own software, libraries and configuration files; they can communicate with each other through well-defined channels.