Generally, latency is a measure of delay. Network latency is any kind of delay it takes for data or a request to go from the source to the destination over a network. Latency is one of the elements that contribute to network speed. Obviously, network latency is often expected to be as close to zero, which can hardly be realized.
Network switches are critical elements of network infrastructure, the latency of which is the one section of the overall network latency. Sometimes when the data packet passes through a device, there is a delay while your switches or routers decided where to send it next. Though the individual pause seems to be brief, they can add up. Therefore, high bandwidth, low latency switches have now become the trends of network deployments for higher performance.