Okay kiddo, so imagine you have two toys - a teddy bear and a ball - and you want to know how much warmth the teddy bear is getting from a lamp that's shining on the ball. The view factor is like a percentage that tells you how much of the lamp's warmth is reaching the teddy bear.
The view factor depends on how close the teddy bear and the ball are to each other, and how big they are. If the teddy bear is really close to the ball and they're both the same size, then the view factor is high and the teddy bear will get lots of warmth. But if the teddy bear is far away or much smaller than the ball, then the view factor is low and the teddy bear won't get much warmth at all.
Scientists use view factor to help design things like buildings and power plants, so they can figure out how much warmth is going to reach different parts of the structure. It's like a map that helps them plan for how much warmth they need in different areas. Cool huh?