We will use the official Docker image of nginx as an example. The image is provided in the Docker Hub (https://store.docker.com/images/nginx), and also the Docker Store (https://hub.docker.com/_/nginx/).
Many of the official and public images are available on the Docker Hub or Docker Store so that you do not need to build them from scratch. Just pull them and set up your custom setting on top of them.
Docker Store versus Docker Hub
As you may be aware, there is a more familiar official repository, Docker Hub, which was launched for the community for sharing the based image. Compared with the Docker Hub, the Docker Store is focused on enterprise applications. It provides a place for enterprise-level Docker images, which could be free or paid for software. You may feel more confident in using a more reliable image on the Docker Store.