I had no idea what a snare wire is until I learned about it from my musically inclined brother, Ron Villanueva.
He said snare wires are does wires stretched across the bottom of a drum head that vibrates sounds when the drum is struck.
My brother bought snare wires a month ago, hoping that it would improve the sound of his snare drums. He said like any other parts of the instrument, a snare wire should also be replaced every once in a while using it, it rings a little less and sound better than his old drum wires, and makes his drums sound a little better. Bet I learned something new today!