Natural language processing (NLP) enables human-computer interaction by allowing machines to understand, interpret, and generate human language. Through techniques such as tokenization, sentiment analysis, and contextual understanding, NLP converts text and speech into data that computers can process. This technology powers applications like chatbots, virtual assistants, and translation services, creating seamless user experiences. By enabling machines to grasp nuances, idioms, and conversational context, NLP enhances communication, making technology more accessible and intuitive for users across various platforms.