During a solar eclipse, what part of the Moon's shadow allows some sunlight to reach the Earth?

During a solar eclipse, the Moon’s penumbral shadow is the part that lets some sunlight reach the Earth. The penumbra is the outer, partially shaded region where the Moon blocks only part of the Sun’s rays, so the Sun is still visible but dimmer. In contrast, the umbra is the deep, fully dark part of the shadow where the Sun is completely hidden. For example, when the Moon moves in front of the Sun, observers in the penumbral zone see a dimming or a “ring of fire,” while those in the umbra see a total eclipse. Thus, the penumbra is the shadow region that allows sunlight to reach the Earth during an eclipse.