[D] Is there a technical term for “LLM that has been trained to accurately answer questions about a narrow subject area?”

For example, say a restaurant fine-tunes an LLM to accurately answer questions about its menu items. Or a bank fine-tunes an LLM to accurately answer questions about the bank’s lending policies.

What would such an LLM be called? Or, what would this style of fine-tuning be called? (I am a near-total noob here, so please go easy on me, senpais.)

bank example lending llm machinelearning narrow questions restaurant technical