Tags are labels that you can add to Splitgraph images. A tag is unique per-repository.

There are two reserved tags, latest and HEAD. latest always points to the most recent image in a given repository. If you have checked out at least one image in a repository, HEAD points to the image you checked-out. If you have not checked out an image, or you have just created the repository, HEAD points to the "empty image" (hash 0000000...).

You can manage image tags using the sgr tag command.