Question

how could latent heat be explained from the graph explain in detail​

Answer 1

The specific latent heat of a substance is the amount of energy needed to change the state of 1 kg of the substance without changing its temperature. Each substance has two specific latent heats  latent heat of evaporation (the amount of energy needed to evaporate or condense the substance at its boiling point)

Answer 2

In order to initiate a phase change and complete it, some energy in the form of heat is required. this heat is called latent heat . thus all the energy supplied during this phase will be utilized only for phase change process and not for increasing the temperature.. thus during the release of latent heat the temperature remains constant