A computer program that simulates human conversation is referred to as a chatbot. Chatbots utilize natural language processing (NLP) to understand and respond to user queries in real-time. They can be deployed across various platforms such as websites, messaging apps, and customer service interfaces. By automating conversations, chatbots improve user experience and streamline customer support. Some advanced chatbots also leverage artificial intelligence to learn from interactions, enabling them to provide more accurate and personalized responses over time.