Why is spring tide stronger than neap tide?

Spring tides are stronger than neap tides due to the alignment of the Earth, Moon, and Sun. During spring tides, which occur during full and new moons, the gravitational forces of both the Moon and Sun combine, resulting in higher high tides and lower low tides. In contrast, during neap tides, which occur during the first and third quarters of the moon, the gravitational forces are perpendicular, leading to lower high tides and higher low tides. This alignment difference is what makes spring tides more extreme.