that effect is a plug-in effect
called AUTO TUNE.,
it automatically raises or lowers a singer's pitch to the desired tone, and can create that machine-like sound sa boses ni Cher.
ANTARES AUTO TUNE ata ang buong pangalan.
you use it within a host application, like say, SONar, or Cakewalk, and Auto tune is one of the 3rd party plug-ins you can use to add color to your sound files.