What is the primary cause of experiencing total darkness during a solar eclipse?

The primary cause of total darkness during a solar eclipse is the Moon moving directly between the Earth and the Sun and blocking the Sun’s light. When the Moon’s disk covers the Sun, the area on Earth inside the Moon’s shadow receives no direct sunlight, just the faint light of the surrounding sky. This alignment of Sun, Moon, and Earth is very precise, so the Moon’s shadow falls exactly on the observer’s location. Because the Sun’s rays are completely blocked, the sky turns dark as if it were night. For example, when the Moon passes over the center of the Sun, the sky near the eclipse path suddenly becomes black, just like a sunset that never ends.