Every light has (makes) a shadow. As they do in real life.
When clicking the shadowcams (in Camera controls), you can see where those shadows will fall.

Have fun.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!