A Photonic Integrated Circuit (PIC) is a technology that integrates multiple photonic devices onto a single chip. These devices can manipulate light in various ways, such as generating, detecting, and guiding it. PICs are used in applications like telecommunications, where they help transmit data over long distances using light instead of electricity, leading to faster and more efficient communication. The main advantage of PICs is their ability to reduce size and power consumption while increasing performance. By combining several functions into one chip, they simplify the design of optical systems. This technology is crucial for advancements in fields like quantum computing and biomedical sensing.