Single-Mode Fiber is a type of optical fiber designed to carry light directly down the fiber with minimal reflection. It has a small core diameter, typically around 8 to 10 micrometers, which allows only one mode of light to propagate. This results in lower signal loss and higher bandwidth over long distances, making it ideal for telecommunications and data transmission. Due to its ability to transmit data over long distances without significant degradation, Single-Mode Fiber is commonly used in applications such as internet backbones, cable television, and long-haul communication networks. Its efficiency makes it a preferred choice for modern communication systems.