What is the relationship between full moons and lunar eclipses?

Full moons occur when the Earth is positioned directly between the sun and the moon, allowing the moon to be fully illuminated. A lunar eclipse happens during a full moon when the Earth passes directly between the sun and the moon, casting a shadow on the moon. Not all full moons result in a lunar eclipse; this phenomenon only occurs when the moon's orbit aligns precisely with the Earth's shadow. Therefore, while all lunar eclipses happen during full moons, not every full moon leads to an eclipse.