Chatbots are software applications designed to simulate human conversation through text or voice interactions. They use natural language processing (NLP) and machine learning algorithms to understand and respond to user queries in a way that mimics human-like communication. Chatbots can be integrated into websites, messaging platforms, and mobile apps to assist users with tasks, answer questions, provide recommendations, and perform various automated functions. They are commonly used in customer service, marketing, and support to enhance user engagement and streamline communication processes.