What’s the difference or how they are related?

Both cannot be differentiated, they work together as a language model.

• NLP (Natural Language Processing) is the broader field of study focused on enabling computers to understand, interpret, and generate human language. NLP encompasses many techniques and tasks such as sentiment analysis, named entity recognition, and machine translation.
• LLMs (Large Language Models) are a powerful subset of NLP models characterized by their massive size, extensive training data, and ability to perform a wide range of language tasks with minimal task-specific training. Models like the Llama, GPT, or Claude series are examples of LLMs that have revolutionized what’s possible in NLP.