To isolate applications in a loose environment (e.g., runtime environment or development environment), Docker works with an image-based deployment model. This makes it possible to share an application or a package of services, with all their dependencies, across multiple environments.
Simply explained,the purpose of a container is the ability to run multiple processes and apps separately from each other, as well as separately from the host system. This results in more secure usage and without interrupting the application, the infrastructure is used more efficiently, and resources are saved at the same time. With resource quotas, it is even possible to limit the amount of memory a container can hold. This improves the efficiency of the environment and also prevents an imbalance in the distribution of these resources across their environment.
Applications can be deployed with a significant reduction in time and successive versions of a container can even be tracked. Differences can be investigated and, moreover, previous versions can be reverted to.