Can you explain the principles of containerization using Docker?

Docker is a platform for containerization that allows you to package an application together with all its dependencies into an isolated container. Containers run on top of the operating system, using its kernel, but are isolated from each other and from the host.

Principles of Docker:

• Image — a template containing everything needed to run an application (code, libraries, settings).
• Container — a running instance of an image, an isolated environment.
• Docker Engine — a service that manages the creation, running, and stopping of containers.

Containers are lightweight, start quickly, and provide a consistent environment across different machines, simplifying development, testing, and deployment.