This is in order to remove tiny, almost invisible, hairs that supposedly had been growing since the last time the subject has performed this ritual. Now, there are certain ways to avoid slicing one's face to ribbons, depending on the subject's dexterity. The easiest way is, of course, not to shave at all. This can result in long, luxurious beard, as seen in many philosophers. This can also result in an ugly stubble.
Results depend on the individual.
Thus it is that many males opt to shave with some regularity. When one shaves, several goals must be kept in mind. This is done by grasping the razor firmly between thumb and the side of the index finger. The razor is then drawn down the face in short, reasonably slow, motions. Note the downward motion.