Single Mode fiber uses a small core to transmit data over long distances with higher speed and less signal loss, making it ideal for telecom and internet backbones. Multimode fiber has a larger core, supports multiple light paths, and is best suited for shorter distances like data centers and local networks. https://www.sdgicable.com/blog-detail/Single-Mode-vs-Multimode-Fiber-Optic-Cable-A-Comprehensive-Guide.html