What is a tag in the context of container images?

What is a tag in the context of container images?

• A. A network port exposed by the image
• B. A directory inside the image
• C. A label used to distinguish a version of a container image
• D. A security fingerprint of the image

Answer: (C)

A tag is a label used to distinguish a specific version of a container image. It acts as a human-friendly reference that points to a particular image manifest stored in a registry, so you can pull exactly the version you want (for example, myapp:1.2.3 or nginx:latest). The tag itself isn’t a network port, a directory inside the image, or a security fingerprint. The actual image content is identified by a digest (a content-addressable hash), and multiple tags can point to the same digest, allowing convenient versioning without duplicating images. If you omit a tag, registries typically default to the latest version.

A tag is a label used to distinguish a specific version of a container image. It acts as a human-friendly reference that points to a particular image manifest stored in a registry, so you can pull exactly the version you want (for example, myapp:1.2.3 or nginx:latest). The tag itself isn’t a network port, a directory inside the image, or a security fingerprint. The actual image content is identified by a digest (a content-addressable hash), and multiple tags can point to the same digest, allowing convenient versioning without duplicating images. If you omit a tag, registries typically default to the latest version.