Why do you see different faces of the moon each night?

The different faces of the Moon that we see each night are due to its phases, which result from its position relative to the Earth and the Sun. As the Moon orbits the Earth, sunlight illuminates different portions of its surface, creating phases such as the new moon, crescent, first quarter, gibbous, and full moon. This cycle takes about 29.5 days to complete, leading to the varying appearance of the Moon over the course of the month.