The Docker Hub is a cloud-based registry service which allows you to store and share container images with other Docker users. It is a hosted repository service provided by Docker for finding and sharing container images with your team. It provides a centralized resource for container image discovery, distribution and change management, user and team collaboration, and workflow automation throughout the development pipeline.
For example, if you have a web application written in Node.js, you can store the container image of the application in the Docker Hub. This allows you to easily share the image with other developers, and also makes it easier to deploy the application on different servers.