•What are
 they?
 –Observational
 Properties
 –Standard
 Model
 •Continuum,
 Lines, etc.
 •How are
 they found?
 –A variety
 of survey types, a zoo of AGNs
 –Orientation
 and Unified Models
 •How do
 they evolve?
 –Strongly!
 •Relationship
 with their host galaxies
 –Host
 galaxies
 –Reverberation
 –Mutual
 Evolution?
 •
 •
 •