What is the benefit for a sort algorithm to be stable?

Question

A sort is said to be stable if it maintains the relative order of elements with equal keys. I guess my question is really, what is the benefit of maintaining this relative o

Answer 1

It means if you want to sort by Album, AND by Track Number, that you can click Track number first, and it's sorted - then click Album Name, and the track numbers remain in the correct order for each album.