What is Docker and Where to Use it? Docker is a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow you to package an application with all of its dependencies into a single, self-contained unit that can be easily moved from one environment to another. Docker is useful in a variety of situations, including: Developing and testing applications: Docker allows you to easily set up an environment for developing and testing applications, ensuring that everything is consistent and reproducible.  Deploying applications: Docker makes it easy to package and deploy applications, allowing you to focus on writing code rather than worrying about the underlying infrastructure.  Microservices: Docker is often used in conjunction with microservices architectures, which involve breaking a large application into smaller, independent services that can be developed and deployed separately.  Cloud computing: Docker is widely used in cloud computing e