A Network Tap is placed in your network, between your interesting traffic, and sends a copy of the traffic to another device, possibly for traffic monitoring.  We have many different kinds of Taps to fit your needs.  Copper Taps, Fiber Taps, Bypass Taps, Aggregation Taps and Replication Taps.  Network Taps are critical in a data center environment to provide visibility to your interesting traffic.