How to use docker image pull command to download images

# Introduction

In this lab, you will learn how to use the `docker pull` command to download Docker images from registries. You will explore different methods for pulling images, including pulling a specific image by its tag from Docker Hub, pulling an image using its immutable digest for guaranteed version control, pulling all tagged images from a repository, and pulling images from registries other than Docker Hub.

By completing these steps, you will gain practical experience in acquiring Docker images, which is a fundamental skill for building and running containerized applications. You will learn how to specify image versions and sources, ensuring you can reliably obtain the images you need for your projects.