When the tides are especially strong due to the alignment of the sun and moon, it's called a spring tide.

Here's why:

* Alignment: During a spring tide, the sun, Earth, and moon are aligned in a line (either all in a row or at a 180-degree angle).

* Combined Gravitational Pull: This alignment means the gravitational pull of the sun and moon combine, resulting in a stronger gravitational force on the Earth's oceans.

* Higher High Tides, Lower Low Tides: This stronger pull causes higher high tides (higher than usual) and lower low tides (lower than usual).

Let me know if you have any other questions about tides!