What is Latency and Latency of network?

Kindly define the term Latency ? And what do we mean by Latency of a network ?

In a network, latency, a synonym for delay, is an expression of how much time it takes for a packet of data to get from one designated point to another. Latency is measured by sending a packet that is returned to the sender and the round-trip time is considered the latency.In a network, latency, a synonym for delay, is an expression of how much time it takes for a packet of data to get from one designated point to another. Latency is measured by sending a packet that is returned to the sender and the round-trip time is considered the latency.