What does the command 'docker tag' accomplish?

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The command 'docker tag' is used to create a tag for an existing image. In Docker, images can have multiple tags that are essentially pointers to the same underlying image. This allows users to categorize or version images easily, making it simple to reference them with different names or versions. For example, tagging an image as myapp:v1.0 gives a specific version identifier, while the same image could have another tag like myapp:latest. Tags are particularly useful in managing different versions or variations of an application.

Creating a tag does not modify the actual image but merely creates an alias or reference that points to it. This functionality is integral in CI/CD pipelines, where specific image versions need to be deployed reliably. It facilitates easier pull requests and deploys in various environments without needing to manage multiple copies of images.

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