The aim of this book is to make accessible to both a general audience and policymakers the intricacies involved in the concept of trustworthy AI. In this book, we address the issue from philosophical, technical, social, and practical points of view. To do so, we start with a summary definition of Trustworthy AI and its components, according to the HLEG for AI report. From there, we focus in detail on trustworthy AI in large language models, anthropomorphic robots (such as sex robots), and in the use of autonomous drones in warfare, which all pose specific challenges because of their close interaction with humans. To tie these ideas together, we include a brief presentation of the ethical validation scheme for proposals submitted under the Horizon Europe programme as a possible way to address the operationalisation of ethical regulation beyond rigid rules and partial ethical analyses. We conclude our work by advocating for the virtue ethics approach to AI, which we view as a humane and comprehensive approach to trustworthy AI that can accommodate the pace of technological change.