The talk will focus in general on AGN and particularly on the narrow-line Seyfert 1 (NLSy1) galaxies. On NLSY1, I shell focus on
our recent new catalog we prepared using the Sloan Digital Sky Survey
Data Release 12 (SDSS DR12) by carrying out systematic analysis through modeling of the
host galaxy, AGN continuum and prominent emission lines of the spectra of all the 68,859 SDSS DR12 objects that are classified as
QSO by the SDSS spectroscopic pipeline with z lt 0.8. Our new catalog
contains a total of 11,101 objects which is about 5 times larger than the previously known NLSy1
galaxies till date. Their monochromatic luminosity at 5100AA is found to be strongly correlated with H-alpha, H-beta
and [O III] luminosities. The optical Fe II strength in NLSy1 galaxies is about two times larger than
the broad-line Seyfert 1 (BLSy1) galaxies. Their cross correlation with Radio(FIRST) and X-ray catalog,
as well as impact of this new enlarged catalog for future AGN studies along with the
key NLSY1 parameter and parameters cross-correlations will also be discussed. The full catalog will be available
on line from APJS catalog pages in future, with all the extracted parameters.