Industry 4.0 is transforming how factories work by using smart technologies to improve speed, safety, and productivity. Key tools include smart sensors for real-time monitoring, cloud computing for easy data access, and advanced robots for fast, accurate tasks. Digital twins help predict problems before they happen, while big data helps make better decisions. Augmented reality supports training and maintenance. With faster communication networks and 3D printing, production becomes more flexible and efficient. These technologies work together to create smarter factories, reduce downtime, and boost overall performance in modern industrial automation systems.