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Docker is an innovative set of PaaS products that offer strategical and operational advantages for developing software applications. It reduces the expense incurred across the infrastructure and maintenance of software applications. It accelerates the productivity and software deployment velocity. Microservices paved the way to build applications with greater scalability. The independent microservice application packs serve as self-sufficient app containers. And containers provide an independent environment and enable them to pack everything into a Docker file. And the different functionalities of software can be packed separately as stand-alone.