Glossary term
What is Docker? Meaning for developers
In DevOps
Packages your app and everything it needs into one image that runs identically on your laptop and on a server.
Learn it properly · DevOpsLesson 9: Docker: Containerize Your Next.js and Node AppImages, layers, Dockerfiles and Compose — build once, run the same thing on your laptop and on EC2.In System Design
The popular tool for building and running containers. Example: docker build, docker run.
Learn it properly · System DesignLesson 55: Docker & Containers for Beginners“It works on my machine” ends here. What containers really are (and aren't), images, layers and registries, a production-grade multi-stage Dockerfile, running and composing containers locally, tags vs digests, and the security basics.