What is the shape of the moon just before and after a FULL MOON?

Just before a full moon, the moon appears as a gibbous shape, where more than half of its surface is illuminated but not yet fully lit. After the full moon, it continues to wane into a gibbous shape as it transitions to the last quarter phase. This gibbous appearance reflects the gradual decrease in the illuminated portion of the moon as it moves toward the new moon phase.