A Docker container is a lightweight runtime package for an application and its dependencies. Docker popularized container workflows and made containers easier for many developers to build, share, and run.
What Docker containers include
A container image usually includes application code, libraries, runtime settings, and system dependencies. When the image runs, it becomes a container.
Docker and Kubernetes
Docker helps package and run containers. Kubernetes helps manage many containers across clusters.
Docker containers are widely used in development, testing, cloud deployment, and microservices systems.