Answer:

They are for "indicating" hidden information. They can give information about a person/thing/place without interupting the situation/sentence. For example:

I went trick-or-treating with Joe (my best friend) on Thursday

or maybe

Run! You're running out of time. The K.O.P. (King of Pollo) got destroyed.

First answer by ID1206110982. Last edit by ID1206110982. Question popularity: 16 [recommend question].