a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and ship it all out as one package. Docker containers can be run on any operating system, making them extremely versatile. Docker containers are also portable, so you can run them on your laptop, on a server in the cloud, or even on your smartphone. Docker containers are lightweight, so they don’t take up much space on your computer. Docker containers are isolated from each other, so you can run multiple containers on the same host without them interfering with each other. Docker containers are easy to create, deploy, and run, making them ideal for development and testing. Docker containers are also great for microservices, so you can break up a large application into smaller, independent pieces that can be run on different servers.