With wireless communication technologies still developing, integrating light fidelity (Li-Fi) with current and future cellular networks offers a viable way to improve data transfer performance. This paper examines Li-Fi’s performance in conjunction with 5G and speculates its possible use in upcoming 6G networks. The advantages, disadvantages, and capabilities of Li-Fi, such as its reliance on the visible light spectrum for data transmission and its possible benefits, which include increased security and high data transfer rates, are also discussed. Further, we look at how Li-Fi and 5G networks can function together, followed by the impact of 6G on light fidelity. Using simulation-based assessments and empirical research, we compare Li-Fi and Wi-Fi performance to prove the reliability and security of Li-Fi.