Docker is a containerization technology that allows you to package an application along with all its dependencies into a single portable shell—a container.
Docker containers launch quickly and run stably in any environment: on local machines, in data centers, and in the cloud.
For businesses, Docker simplifies the processes of developing, testing, and deploying applications, makes infrastructure more flexible, and speeds up the release of new versions.
Docker allows you to run multiple instances of the same application on a single server, isolating them from each other.
Thanks to its popularity, Docker integrates with most modern CI/CD tools and orchestrators such as Kubernetes.