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.
References:
https://networkengineering.stackexchange.com/questions/52232/whats-the-difference-between-latency-and-round-trip-time
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