Natural language processing (NLP) enhances human-computer interaction by enabling machines to understand, interpret, and respond to human language in a meaningful way. This technology allows users to engage with systems through voice commands, chatbots, and written text, creating more intuitive and natural interactions. By bridging the gap between human language and computer understanding, NLP improves user experience and accessibility. It's widely applied in fields like customer support, voice-activated assistants, and sentiment analysis, ultimately leading to more personalized and efficient interactions.