Does heat energy increase decrease or stay the same during change of state?

During a change of state, such as melting or boiling, heat energy is absorbed or released, but the temperature of the substance remains constant. For example, when ice melts into water, heat energy is absorbed, which increases the internal energy of the molecules without raising the temperature. Conversely, when water freezes, heat energy is released, but again, the temperature stays constant until the phase change is complete. Thus, while heat energy changes, the temperature remains stable during the transition.