Relationship between market and catalog object

Hi,

I’m seeing that there may be some inconsistency regarding the relationship between the market and catalog objects.
The first link I referred to suggests that there are many markets for each catalog, with a ratio of Many (Market) : 1 (Catalog).
However, the second link, which defines the market object, indicates that there could be multiple MarketCatalogs.
I’m feeling a bit confused at this point, so could someone please provide me with a clear explanation of which understanding is correct?

https://shopify.dev/docs/apps/markets/catalogs
https://shopify.dev/docs/api/admin-graphql/2023-04/objects/market

Thanks