# Docker * Founded in 2010 * Most popular container engine * Available on Linux, Mac, Windows * Requires root privileges Docker manages [Dockerhub](https://hub.docker.com), a central repository where people can upload Docker images to share to the wider community. We're going to grab an image from Dockerhub and use it for some examples. A very basic image available on Dockerhub is the Ubuntu image, which provides a bare-bones Ubuntu environment. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://igb.mit.edu/mini-courses/advanced-utilization-of-igb-computational-resources/containerization/docker.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.