Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process — usually a first-order phase transition. Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature.
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A minimum heat needed to convert the state .like ice into water a very simple example for this.
It is a hidden heat used in changing the state of substance i.e. from solid to liquid or from liquid to gas without changing the temperature.