The RObot Interaction Language (ROILA) is a new spoken language that is optimized for the communication between machines and humans. It is extremely easy to learn for humans and it is simple for machines to recognize. The goal of this book is to support humans learning ROILA. The book is structured in ten chapters. It starts with the basics of the language, grammar and pronunciation before putting the language into context. The book covers typical scenarios in which the language can be used, such as interacting with robots, humans, and society. The book provides practical examples and exercises and you can participate in the official ROILA exam to become an official translator.