An entity is an abstraction used by the API. It represents a set of objects (or entities) that uses shared code/endpoints to perform tasks.
This makes the Infinity Bot List API more generic and allows for reviews, voting etc. to work out-of-the-box for new systems like packs and s erver listing.
The list of entities in the API are non-exhaustive. Some entities do not support all actions, or may support certain actions etc.