# Docker Registry ## Theory Docker Registries, at their fundamental, are used to store and provide published Docker images for use. Using repositories, creators of Docker images can switch between multiple versions of their applications and share them with other people with ease. Public registries such as DockerHub exist, however, many organisations using Docker will host their own "private" registry. --- # 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://red.infiltr8.io/cloud-cicd-pentesting/ci-cd/registry.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.