it depends what phase the moon is in search phases of the moon then you'll understand
The moon is ALWAYS 50% (+/-) illuminated. Though we only see all of the half lit side when the moon is opposite the sun (Full Moon).
Before the new moon, less of the moon is lit up when viewed from Earth.After the mew moon, more of the moon is lit up when viewed from Earth.
About half of the moon is always lit by the sun. This is because only one half of the moon is visible from Earth at any given time. The amount of light that can be seen from Earth reflects different phases of the moon as it orbits.
Full Moon
When the moon is completely lit up, it is called a full moon. This occurs when the Earth is between the sun and the moon, causing the moon's entire sunlit side to be visible from Earth.
full moon
One hemisphere is always lit except when the moon is occulted by the earth.
The amount of the moon that is illuminated by the sun varies as the moon orbits Earth. At any given time, half of the moon is lit by the sun, but we can see different portions of this lit side from Earth depending on the moon's position in its orbit.
Half of the moon is always lit by the sun, unless the sun is eclipsed by the Earth. The portion of the illuminated moon viewed from Earth depends on the moon's orbit. As the moon orbits, different portions of shadow and illumination are seen from Earth, creating the moon's phases.
eclipse
Full moon
Half of the moon is always lit. Due to it's position in relation to the sun and the earth, we see a different moon every night.