Rasa is an open-source framework designed for building conversational AI, particularly chatbots. It allows developers to create intelligent virtual assistants that can understand and respond to user inputs in a natural way. Rasa uses machine learning to improve its responses over time, making it adaptable to various applications. The framework consists of two main components: Rasa NLU for natural language understanding and Rasa Core for dialogue management. Together, they enable the creation of complex conversational flows, allowing users to interact with the bot in a more human-like manner. Rasa is widely used in industries such as customer service and e-commerce.