Docker

Before Docker's introduction, containers (process isolation) were a concept that had been around for some time, particularly in the Linux ecosystem. Linux containers use kernel features like cgroups (control groups) and namespaces to manage system resources and provide process isolation. However, container management often required a deep understanding of Linux internals and command-line tools. Technologies like Linux Containers provided the foundational capabilities but needed to be more user-friendly, making it difficult for developers without extensive system administration experience to leverage them effectively. As a result, container technology adoption was greatly accelerated when Docker introduced an open-sourced Docker Engine in 2013. Docker Engine set a new standard for container use with easy tools for developers and defined a universal approach for how containers should be packaged.