Industry 4.0 refers to the fourth industrial revolution characterized by the intelligent networking of machines and processes through information and communication technology. It takes digital technology to a new level with interconnectivity through the Internet of Things, access to real-time data, and cyber-physical systems. Key technologies include autonomous decision making, mass customization, collaborative robots, robotics, the Internet of Things, and artificial intelligence. Potential applications are smart homes, factories, driverless cars, autonomous robots, and smart cities.