How are terms heat of fusion and melting point related?

The heat of fusion and melting point are closely related concepts in thermodynamics. The melting point is the specific temperature at which a solid transitions to a liquid, while the heat of fusion is the amount of energy required to change a substance from solid to liquid at that melting point, without changing its temperature. Essentially, the heat of fusion is the energy needed to overcome the intermolecular forces holding the solid together, allowing it to melt at the defined melting point.