A citation source is a domain an answer engine actually leans on when it composes an answer in your category. Not where you wish it looked: the real publisher pages behind the sentences an engine returns when a customer asks.
Why it matters
When an engine answers a question in your category, it is quoting from somewhere. The domains it leans on are the ones shaping what your customers hear, whether or not you are one of them.
Knowing those domains tells you where the answer is really made. It is the difference between guessing why an engine describes your category a certain way and seeing the sources it drew from.
It is also a target list. If a handful of domains keep getting cited and you are not among them, those are the pages your own content has to earn a place beside.
How Jinn treats it
Fama reads the citations the engines actually return on your category's questions and canonicalizes each one to its real publisher domain, lowercased and de-duplicated. Bare URLs and engine redirect shims, the ones that are not real sources, are dropped so the list is not padded.
What you get is the set of domains behind the answers, ranked by how often they appear, so the sources doing the work are visible instead of inferred.
Related terms
See the sources behind the answer.
The domains an engine cites in your category are where the answer is really made. See how Fama reads them.