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+# Definitions and Terms
+
+A collection of definitions and terms used within this repository.
+
+## TOC
+
+* [Fingerprint](#fingerprint)
+* [Fully Qualified Artifact Reference](#registry-fully-qualified-reference)
+* [OCI Annotations](#oci-annotations)
+* [OCI Descriptor](#oci-descriptor)
+* [OCI Index](#oci-index)
+* [OCI Manifest](#oci-manifest)
+* [Registry](#registry)
+* [Repo/Repository](#repo/repository)
+* [Repository Path](#repository-path)
+* [SBoM](#sbom)
+* [Subject](#subject)
+* [Tag](#tag)
+
+## Artifact / Image
+
+Artifacts are a generalization of how images are stored in an instance of the [OCI Distribution Spec][oci-distribution-spec]. An [OCI Image][oci-image] is a type of [OCI Artifact][oci-artifact]. When referencing artifacts, within a [fully qualified reference](#registry-fully-qualified-reference), the artifact is right most element of the namespace, combined with the `:tag`.  
+Reference: [OCI Artifacts][oci-artifact]  
+![](./media/artifact-ref.png)  
+
+
+## Fingerprint
+
+A short identifier of a given public key.  
+Reference: [Fingerprint][fingerprint]
+
+
+## OCI Annotations
+
+A key-value map that can be associated with [OCI Descriptors][oci-descriptor] and [OCI Image manifests][oci-manifest].  
+OCI spec reference: [OCI Annotations][oci-annotations]
+
+## OCI Descriptor
+
+A structure describing content, including the media type, a content-addressable digest, the size, and other properties. Descriptors are used to describe layers and configuration in a manifest.  
+OCI spec reference: [OCI Descriptor][oci-descriptor]
+
+## OCI Index
+
+A higher-level collection of [image manifests][oci-manifest], or other [oci indexes][oci-index], typically used to describe platform-specific (architecture and operating-system) images that can be identified collectively and referred to together. The specific image manifests are identified by modified [descriptors][oci-descriptor] with additional properties and restrictions. [OCI Artifacts][oci-artifact] are another use-case for indexes where an OCI Index can reference a collection of artifacts, such as an image, a deployment chart, its SBoM and deployment configuration references.
+OCI spec reference: [OCI Image Index][oci-index]
+
+## OCI Manifest
+
+A description of an [artifact][oci-artifact]. The manifest references optional configuration and blobs (layers) as content-addressable references ([descriptors][oci-descriptor]).  Artifacts may be container images, helm charts or other artifact types that may be signed and stored in a registry.    
+OCI spec reference: [OCI Image Manifest][oci-manifest]
+
+## Registry
+
+A registry is a collection of [OCI Indexes][oci-index] and [OCI Manifests][oci-manifest] for a specific org or entity.  
+A unique registry may be uniquely identified with a domain or a root namespace:  
+![](./media/unique-registry-domain-ref.png)  
+![](./media/unique-registry-namespace-ref.png)
+
+## Repo/Repository
+
+A repo/repository refers to the unique location, within a registry. When referring to a repo, the registry is assumed, based on the context.  
+![](./media/registry-repo-ref.png)
+
+## Repository Path
+
+A path, within the [unique registry org](#multi-tenant-registry), up to, but not including the repository (repo) name.  
+![](./media/registry-namespace-ref.png)
+
+## Registry: Fully Qualified Reference
+
+In order to deploy an artifact, a fully qualified reference is required. This includes the unique registry, namespace, repo and tag.  
+![](./media/fully-qualified-artifact-ref.png)
+
+## SBoM
+
+Represents a generic, non-project specific, reference to a Software Bill of Materials. Similar to the automotive industry which tracks the components that make up a vehicle, the SBoM may contain the list of packages used within the artifact, the compiler and version used to build the artifact and other relevant information.  
+Additional reference: [Software bill of materials][sbom]
+
+## Subject
+
+The data that is signed.
+
+## Tag
+
+Information that represents a version, or platform specific version of the artifact. 
+eg:
+- `example.com/org/namespace/artifact:tag`
+- `org.example.com/namespace/artifact:tag`
+- `org.example.com/databases/somedb:v1` (multi-arch tag)
+- `org.example.com/databases/somedb:v1-alpine` (platform specific tag)
+- `org.example.com/databases/somedb:v1-windows` (platform specific tag)
+- `org.example.com/databases/somedb:v1-helm` (helm chart to deploy a platform specific image)
+
+
+[fingerprint]:           https://en.wikipedia.org/wiki/Public_key_fingerprint
+[oci-annotations]:       https://github.com/opencontainers/image-spec/blob/master/annotations.md
+[oci-artifact]:          https://github.com/opencontainers/artifacts
+[oci-descriptor]:        https://github.com/opencontainers/image-spec/blob/master/descriptor.md
+[oci-distribution-spec]: https://github.com/opencontainers/distribution-spec
+[oci-image]:             https://github.com/opencontainers/image-spec
+[oci-index]:             https://github.com/opencontainers/image-spec/blob/master/image-index.md
+[oci-manifest]:          https://github.com/opencontainers/image-spec/blob/master/manifest.md
+[sbom]:                  https://en.wikipedia.org/wiki/Software_bill_of_materials
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