A historic introduction, and recent highlights on NLS1 galaxies: giant outbursts, changing-looks, and MWL properties

NLS1 galaxies are an AGN population with extreme and remarkable properties at all wavebands. After a brief historical introduction into the early development, discoveries, and major open questions, I present selected recent results and discoveries on NLS1 galaxies. Focus is on huge-amplitude outbursts, rare changing-look events in NLS1 galaxies, radio and MWL properties of individual exceptional NLS1 galaxies, and an outlook into the study of NLS1 galaxies with the recently launched space mission SVOM