Point of View means the perspective that someone is seeing it from.
If in a book someone, lets say Jack, talks about listening to a friend talk about how someone was mean, that was the point of view of Jack.
If there is a description about a bird seeing a worm in a corn field, that is the birds point of view.
It can be as simple as that, or it can be as complex as someone saying that at their point of view they saw Jane being mean, but at Jane's point of view, she wasn't at all.