G'Day

Being quite new to this hobby and not having visited a local club yet, I am still at the very early stages of learning what's what. I have seen in a few posts that people talk about using seperate servos on the Ailerons to make Flapperons instead but I have know idea what that means or the advantages of it? I have searched the forum but can't find it explained anywhere so if someone would be so kind to do so, it would be much appreciated.

Cheers