The general objective of this book was to determine the developments related to the Fourth Industrial Revolution: Industry 4.0. The specific objectives were to identify the countries investing the most in Industry 4.0 and the best Industry 4.0 companies worldwide.On the general objective of the book, to determine the developments related to the Fourth Industrial Revolution: Industry 4.0. Some emerging technologies are: Internet of Things (IoT), artificial intelligence and cognitive computing, big data, augmented and virtual reality, cloud computing.As for the first specific objective of the book, to identify the countries that invest the most in Industry 4.0. Switzerland, Sweden, the United States, Singapore and the United Kingdom are the most innovative economies in the world.Regarding the second specific objective of the book, the best Industry 4.0 companies worldwide are: ABB Ltd, Rockwell Automation Inc, Schneider Electric, Cisco Systems Inc, Intel Corporation.