NLU is the subset of NLP focused specifically on interpreting the meaning and intent behind language. Where NLP covers the full range of language tasks, NLU is concerned with comprehension: what is the user trying to say, what do they want, and what context is relevant?
Accurate NLU is what enables AI systems to handle varied phrasings of the same underlying request without needing exact keyword matches. A routing system that can understand that "I can't get into my account," "my login isn't working," and "access issue on the portal" are all the same request — and routes them all correctly — is relying on strong NLU.
