Azure Compute Gallery allows to store images and VM apps.

It allows for

1. Replication (to other regions, subscriptions, etc.)
2. Versioning (specify a source,)
   1. Some services in Azure see that a new version is available and they auto-update.

Images and VM apps both have

• a definition which tells it what source to use.
• a version which is what is used when running install/creating a vm In case of images source can be a shutoff VM, an image from marketplace, etc. In case of VM app, it is packages kept on a blob somewhere + commands to install and uninstall, update, etc.

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references:

John’s VM course Compute Gallery Overview