> For the complete documentation index, see [llms.txt](https://experience-digital-transform.gitbook.io/experience-digital-transformation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://experience-digital-transform.gitbook.io/experience-digital-transformation/cloud-for-dpi/chapter-2/containers-give-applications-a-clearer-unit-of-operation.md).

# Containers give applications a clearer unit of operation

A public service may have a web interface, an application programming interface, a document-processing function and a notification task. Each is part of the same public outcome, but they can have different technical roles. As the number of components and services grows, undocumented changes on long-lived servers become harder to review, update and recover.

Containers address part of that problem. A container packages an application component with the runtime files it needs. It gives a team a clear unit to run, update and replace. If a component must be deployed in several environments, the package can reduce the differences that arise from hand-built server changes.

A container and a virtual machine are related but different. A virtual machine provides an operating boundary with allocated compute, storage and networking. A container packages one part of an application that runs inside an approved environment. A service may use virtual machines, containers or both. Neither is a complete public-service boundary on its own.

A virtual machine can return while identity remains unavailable. A container can be replaced while persistent data, an interface or a certificate relationship is still broken. Containers make application components easier to handle. They do not decide whether a service is trustworthy, recoverable or ready for the public.

<figure><img src="https://1406653965-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FkZFMZ3jCMUwHtTN0sL4J%2Fuploads%2Fgit-blob-2f0d4db4ffea9e0e5865e6bb28d52d1fb8a41a1d%2Ffinal.png?alt=media" alt="Containers provide a common workload runtime: the cloud foundation supports containers and orchestration, while data and backups, network policy, identity and secrets, logs and monitoring, and operational ownership still need explicit treatment."><figcaption><p>Figure 3. Containers package an application and its runtime dependencies. Orchestration helps operate many such workloads consistently. Neither replaces the service-specific work of protecting state, controlling access, observing behaviour, and assigning ownership.</p></figcaption></figure>


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