Both the Moon and the Earth orbit or travel around the Sun. The Moon also orbits the Earth taking 27.5 days to complete its path around the Earth. In addition to the Moon and Earth orbiting around the Sun, they each rotate around an axis. The Earth's rotation takes one day to complete while the Moon's rotation takes the same amount of time as its orbit around Earth (27.5 days). It is because the rotation and orbit of the Moon are exactly the same that we only see one side of the moon. If the rotation of the Moon was different than its orbit, we would see the far side of the moon; however, since the rotation keeps up with the orbit, we only see one side of the moon.

I found a really good video with explanation: