Most Docker images are stored in a central repository called the Docker Hub. However, you can also store images locally on your own computer.
When you run the docker pull command, the image is downloaded from the Hub and stored on your computer.
You can view all of the images stored on your computer by running the docker images command.
The Docker Hub is a great place to find pre-built images that you can use for your own projects. If you need an image that is not available on the Hub, you can build it yourself using the docker build command.
Once you have built an image, you can push it to the Docker Hub so that others can use it.