A new entity type for managing data that should be stored in the database, but only displayed within or associated with other content. If you're using a solution like Rabbit Hole to prevent direct access to an entire content type, that content might be better stored as storage entities.
Lightweight by design, but fieldable just like content types. This module is similar to Basic Data but where that module requires a "data" blob in addition to a name, this module only requires a name, and any other fields can be completely custom to suit your specific needs. Also, this module is designed to be revisionable and translatable.
A storage entity might be suitable for anything that does not logically fit into the concept of a node, paragraph or media entity, but where it makes sense to have a subset of fields. Think of a generic entity type for standalone objects.