Docker
A platform that packages your application and all its dependencies into a portable container that runs the same everywhere.
Docker solves the "it works on my machine" problem. A Docker container bundles your app's code, runtime, libraries, and system tools into a single image. That image runs identically on your laptop, a coworker's machine, a CI server, and a production cloud instance.
A Dockerfile is a recipe that describes how to build the image: start from a base (like Node 20), copy your code in, install dependencies, and define the startup command. Docker Compose lets you define multi-container setups (app + database + Redis) in a single YAML file.
For vibe coders, Docker is most useful when deploying or sharing projects. AI tools can generate Dockerfiles and Compose configurations from a description of your stack. Understanding the basics (images, containers, volumes, ports) helps you debug deployment issues and work with any cloud provider.
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