Co-Packaged Optics (CPO) is a technology and design approach where optical components, such as lasers and photodetectors, are integrated alongside electrical components, like Application-Specific Integrated Circuits (ASICs), within the same package. As datacenters strive to meet escalating demands for efficiency and bandwidth, particularly with the integration of AI and ML technologies, optics is poised to play a crucial role in shaping the future of interconnect architecture and performance. CPO is widely regarded as a promising. CPO revolutionizes data center design by integrating optics and electronics, leading to improvements in power efficiency and bandwidth density. As applications like AI and machine learning become more prevalent, demanding higher bandwidth data processing capabilities, CPO technology provides a. From Jensen Huang showcasing CPO switches at GTC 2025 to a wide range of vendors demonstrating optical engines integrated inside ASIC packages at OFC 2025, CPOs are everywhere. This article provides a comprehensive overview of CPO optical modules, exploring their technology, benefits, challenges, and the pivotal role they play in future data centers. CPO, or Co-Packaged Optics, is a term often mentioned alongside LPO. Let's delve into its meaning and significance.