Currently, the Human Computer Interaction (HCI) and User Experience (UX) design is a hot topic to nurture and practice in various industry as related knowledge is very relevant to create best quality consumer experiences and thus increases the chance of product/service/software acceptance in the market. This book provides concise information on HCI and UX Design. A practice-oriented contents are presented inside this book in these fields of study. This book covers principles of interaction design, Information Design, System design, user interface (UI) design, human factors engineering, essential UX process & methods, usability engineering etc. and fundamentals of UI prototyping is also covered in this book. Strategies to design interfaces for augmented reality (AR), virtual reality (VR), extended reality (ER), AI based Virtual Agents and Chatbots are also elaborated in this book. This book is also serving as a guide for design ethics and intellectual property rights (IPR). It is worth to have this book by the UX & UI design Practionars, and Aspirants of HCI and UX Design, to gain the knowledge in these domains very quickly. The UX design students and the students of Computer Science & Engineering can also refer this book as a tutorial for their curriculum.