  Narrow Line Seyfert 1 galaxies (NLS1s) are intriguing due to their continuum
as well as emission line properties. The observed peculiar properties of the
NLS1s are believed to be due to accretion rate close to Eddington limit. As a
consequence, for a given luminosity,
  NLS1s have smaller black hole (BH) masses compared to normal Seyfert
galaxies. Here we argue that NLS1s might be Seyfert galaxies in their early
stage of evolution and as such may be low redshift, low luminosity analogues of
high redshift quasars. We propose that NLS1s may reside in rejuvenated, gas
rich galaxies. We also argue in favor of collisional ionization for production
of FeII in active galactic nuclei (AGN).
