The function of natural language processing (NLP) in AI is to enable machines to understand, interpret, and respond to human language in a way that is both valuable and meaningful. NLP combines elements of computer science, linguistics, and artificial intelligence to facilitate interactions between humans and machines. Applications of NLP include speech recognition, language translation, and sentiment analysis. By improving language comprehension, NLP enhances user experiences in tools like chatbots, virtual assistants, and information retrieval systems, making technology more accessible and efficient.