The document discusses the four industrial revolutions (Industry 1.0 to 4.0) and their impact on manufacturing technologies. Industry 1.0 introduced mechanization via steam power in the 18th century. Industry 2.0 brought mass production using electrical energy. Industry 3.0 began automation through electronics and computing. Currently, Industry 4.0 integrates cyber-physical systems using IoT, cloud, AI and advanced manufacturing like 3D printing to create smart factories with increased productivity and efficiency. The technologies of Industry 4.0 like IoT, big data, cloud computing, AI, machine learning, additive manufacturing and cyber-physical systems are transforming modern manufacturing.