In the preceding table, we mentioned official image a few times. This needs an explanation. Images are stored in repositories on the Docker Hub registry. Official repositories are a set of repositories that are hosted on Docker Hub and are curated by individuals or organizations that are also responsible for the software that is packaged inside the image. Let's look at an example of what that means. There is an official organization behind the Ubuntu Linux distro. This team also provides official versions of Docker images that contain their Ubuntu distros.
Official images are meant to provide essential base OS repositories, images for popular programming language runtimes, frequently used data storage, and other important services.
Docker sponsors a team whose task it is to review and publish all those curated images in public repositories on Docker Hub. Furthermore, Docker scans all official images for vulnerabilities.