NLP is a branch of AI that focuses on the interaction between computers and human language. It involves the ability of machines to understand, interpret, and generate human language, enabling them to analyze and respond to text or speech inputs. For websites, NLP deep learning can enhance user interactions by enabling features like chatbots, voice assistants, sentiment analysis, and language translation. According to statistics about AI, the NLP market is projected to exceed $40 billion by 2025, highlighting its growing impact across industries.