<p>This research paper presents a comprehensive analysis of Free Space Optical (FSO) and Underwater Optical Communication (UWOC) systems, highlighting their recent advancements and performance characteristics. FSO technology utilizes light to transmit data through the air, offering high-speed communication with minimal latency. However, its effectiveness can be compromised by adverse atmospheric conditions such as fog and rain. Conversely, UWOC employs similar optical principles to facilitate communication underwater, overcoming the limitations of traditional radio frequency methods. The study investigates the impact of various environmental factors, including atmospheric turbulence and water quality, on the performance of FSO and UWOC systems. By conducting experiments and simulations, we analyze key performance metrics such as bit error rates and quality factors. The findings demonstrate the potential of these optical communication technologies to provide reliable. and efficient data transmission in both aerial and underwater environments, paving the way for future applications in telecommunications, marine exploration, and beyond.</p>