What's the difference between `Latency` and `Round Trip Time`? Golang community provide a HTTP/2 demo website to compare the performance between HTTP 1.1 and HTTP/2. We can choose different `latency`, e.g. 0s latency, 30 ms latency, 200ms latency. 1. Is `latency` a terminology of computer science? 2. What does that mean? 3. What's the difference between `latency` and `Round Trip Time`? ![enter image description here](

Network latency is how long it takes for something sent from a source host to reach a destination host. There are many components to latency, and the latency can actually be different A to B and B to A.

The round trip time is how long it takes for a request sent from a source to a destination, and for the response to get back to the original source. Basically, the latency in each direction, plus the processing time.