Using Sulfur as metallicity tracer in galaxies
  We review the present methodology for the use of Sulfur as global metallicity
tracer in galaxies, which allows performing a complete abundance analysis using
mainly the red to near infrared spectral region, and extending the range of
directly derived abundances up to 5 times the S solar photospheric value. The
empirical calibration of Sulfur via the S23 parameter is also reviewed.
