Docker

Docker provides tools and services for packaging applications into containers so they can run consistently across development, testing, and production environments.

Developers define an application's dependencies and configuration alongside its code, then build an image that can be shared and run on compatible systems. This reduces differences between a laptop and a deployment environment and makes complex setups easier to reproduce.

Docker also supports workflows for storing, distributing, and managing container images. It is widely used by individual developers and engineering teams to make application environments more predictable and to support modern software delivery practices.

A Dockerfile describes how an image is assembled, making an application's runtime and dependencies easier to reproduce across machines.

Compose can coordinate multiple services for local development, while registries provide a place to store and distribute images used by build and deployment systems.

Smaller, carefully maintained images can improve startup and security, and explicit configuration makes it easier for teammates to understand how a service runs.

Containers do not automatically solve every deployment or security concern, so images and permissions still need regular review. Docker is valuable because it gives teams a common packaging format from local development through automated delivery.