1.Frontal lighting refers to light which comes directly in front of your subject (the light source is behind you and the camera). The situation is possible or when your subject is facing the light source (for example face directed to a setting or a rising sun).
2. when the light travels in a direction and it is blocked by an opaque object, it does not allow the light to pass through it because of which the image(shadow)
Correct me if I'm wrong!