* Stars do exist, even if you can't see them at night. The vast majority of stars are simply too far away for us to see with the naked eye. Even with powerful telescopes, we can only see a tiny fraction of the stars that exist in the universe.

* You can see stars at night, but not all of them. The stars you see are the ones closest to us, bright enough to penetrate the Earth's atmosphere.

* The night sky is full of things besides stars. You can see the Moon, planets like Venus and Mars, and sometimes even satellites.

So, the answer is: Stars exist, but we can only see the ones that are bright enough and close enough to our planet.