簡単な回答
World info and lorebooks solve the same broad problem: they keep large fictional settings available without permanently spending context on every fact.
平易な言葉の意味
If the scene mentions a city, faction, spell, family, or object, the world-info entry for that thing can be added for the model to read.
World-info pages help users moving from advanced tools understand which concepts matter in a simpler web character-chat app.
OnlyKin can present worldbuilding as guided structure instead of making setup feel like a configuration project.