  White dwarf stars are the final stage of most stars, born single or in
multiple systems. We discuss the identification, magnetic fields, and mass
distribution for white dwarfs detected from spectra obtained by the Sloan
Digital Sky Survey up to Data Release 13 in 2016, which lead to the increase in
the number of spectroscopically identified white dwarf stars from 5000 to
39000. This number includes only white dwarf stars with log g >= 6.5 stars,
i.e., excluding the Extremely Low Mass white dwarfs, which are necessarily the
byproduct of stellar interaction.
