Chatbots have the capability to facilitate information retrieval for users by promptly addressing inquiries and demands, using text input, voice input, or a combination of both, hence eliminating the need for human involvement or manual investigation. The use of chatbot technology has become widespread, with its presence seen in many settings such as smart speakers in households, consumer-oriented platforms like SMS, WhatsApp, and Facebook Messenger, as well as business communication tools like Slack. The most recent advancement in AI chatbots have the capability to comprehend natural and unstructured conversations by using advanced language models. Furthermore, these chatbots are capable of automating pertinent duties. This book focuses on most recent topics related to chatbots, beginning from chatbots basics, work, development, use cases and more. This book is intended to be used by university students, researchers and practitioners interested in Emotion Artificial Intelligence.