A fiber network tap is a small device used in fiber optic networks to copy data as it passes through the cables. It works like a splitter that takes the light signal from the main fiber line and sends a small part of it to another line for monitoring. This allows network administrators to watch the traffic without interrupting or slowing down the main data flow. Fiber taps are often used for network security, troubleshooting, and performance checks. They help detect problems, intrusions, or data loss in real time. Because they are passive devices, they do not change or damage the data being sent. Fiber network taps are very useful in large networks where constant observation and safety are important.