> For the complete documentation index, see [llms.txt](https://fall2019.fullstackdeeplearning.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fall2019.fullstackdeeplearning.com/course-content/testing-and-deployment/docker.md).

# Docker

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Docker - Testing and Deployment
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## Summary

* Docker is a computer program that performs operating-system-level virtualization, also known as **containerization**.
* A container is a standardized unit of fully packaged software used for local development, shipping code, and deploying system.
* Though Docker presents on how to deal with each of the individual microservices, we also need an orchestrator to handle the whole cluster of services. For that, **Kubernetes** is the open-source winner, and it has excellent support from the leading cloud vendors.