The Cher Effect

You may think you don’t know it, but you most certainly do.
Hometracked has the skinny:

When used noticeably, an auto-tuner produces what most call “The Cher Effect“, named for her trademark sound in the song Believe. (In essence, we named the effect like scientists naming a new disease after its first victim.) Treated this heavily, a vocal track sounds synthetic, and obviously processed.