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Docker is an open-source platform that allows developers to automate the deployment, scaling, and management of applications using containerization. It was first released in 2013 and has since gained popularity due to its ease of use and flexibility.Containers are lightweight, isolated environments that package all the necessary software dependencies for an application to run. Docker uses containerization technology to create and manage these containers efficiently. Each container runs on the host operating system, making them lightweight and portable across different platforms.Docker provides a simple command-line interface (CLI) that allows developers to build, ship, and run containers with ease. It also offers a centralized repository called Docker Hub where users can store and share container images. These images serve as templates for creating containers, making it easy to deploy applications in various environments.Key features of Docker include:1. Portability: Containers can be easily moved between different computing environments, such as development machines, testing servers, or production servers.2. Scalability: Docker allows applications to scale horizontally by replicating containers across multiple hosts.3. Efficiency: Containers have low overhead compared to virtual machines since they share the host operating system kernel rather than running a separate operating system instance.4. Isolation: Containers provide isolation at the process level, ensuring that one container does not impact the performance or security of another container on the same host.5. Version control: Docker supports versioning of containers through images, allowing developers to easily roll back or update deployments as needed.Overall, Docker simplifies the process of deploying applications by eliminating compatibility issues and streamlining the deployment workflow. Its popularity has led to widespread adoption in software development and deployment pipelines worldwide.

Docker's main products include Docker Engine, Docker Hub, and Docker Desktop.