Answer:
There are two kinds of apostrophe in English.
This question is about the literary term where a non-living thing is spoken to.
For the punctuation mark (the raised comma), see the related question below.
In the poem "The Rising Sun" by John Donne:
"Busy old fool, unruly Sun,
Why dost thou thus,
Through windows, and through curtains, call on us?"
Donne is personifing the Sun, and addressing it as if it could respond.
Another example of apostrophe is:
"You stupid chair!"
Pretend you hit your toe on a chair. You are talking a non-living object. The definition of apostrophe is: A person not present that is spoken to. Now, a chair is not a person, but another definition just states that apostrophe is when you talk to something that is either not there, or not alive.