UV comes in different bands. We call them all "UV" because it is short and easy and for everyday speech this is close enough. The UV you find in flashlights is UV-A, around 400 nanometers and shorter which is only a little shorter wavelength than we can see. You can think of UV-A as being just a little more violet than we can observe. We use it to make things fluoresce, which is cool, and not harmful to you.
UV-C is a different animal. It is a *really* short wavelength, down around 10 nanometers, so its behavior is different. The Earths atmosphere filters out UV-C from the Sun before it gets to ground level, so nothing that lives here is really used to it, we have never had to be. When UV-C comes into contact with organic materials, like viruses, or germs, or you, it tends to penetrate into and interact with living tissues. Unfortunately this interaction is always damaging for the tissue.
With microorganisms it tends to sterilize rather than kill them. Once they can't reproduce inside you they are harmless, so we use UV-C in pipes and ducts for air and water. The air or water has to be clean though; if it is cloudy micros may survive and pass through in the shade.
If you look at the package any of those UV-C germ killing bulbs come in they are covered with dire warnings about not looking at the light. The housings that hold the bulbs are always set up so there is no line-of-sight between you and the bulb when it is on. Take those warnings seriously, and don't defeat the protective housings, The inside of your eye is built of the same stuff as microorganisms, and your eyes cannot handle UV-C any better than they do.