Docker

Docker is a software platform that allows developers to build, run, test, and deploy applications quickly and easily using containers. Containers are lightweight, standalone packages that contain everything an application needs to run - the code, runtime, system tools, libraries, and settings.

With Docker, developers can easily package an application and its dependencies into a Docker image. This image can then be shared and run on any system that has Docker installed, from a developer's laptop to test servers to production environments. When running a Docker container from the image, the developer can be sure the application will run exactly the same, regardless of where it's deployed.

Docker makes it easy to scale up applications by running multiple container instances across servers. It also allows rolling updates by slowly replacing running containers with new ones. Docker implements isolation at the container level, so applications and resources are segregated and unable to interfere with each other. This makes Docker popular for microservices architectures. Overall, Docker enables faster software delivery by simplifying and standardizing how applications are built, shared and run on diverse infrastructures.