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The spectra of Active Galactic Nuclei (AGNs) are often characterized by awealth of emission lines with different profiles and intensity ratios that ledto a complicated classification. Their electro-magnetic radiation spans morethan 10 orders of magnitude in frequency. In spite of the differences betweenvarious classes, the origin of their activity is attributed to a combination ofemitting components, surrounding an accreting Super Massive Black Hole, in theso called Unified Model. Currently, the execution of sky surveys, withinstruments operating at various frequencies, provides the possibility todetect and to investigate the properties of AGNs on very large statisticalsamples. Thanks to the spectroscopic surveys that allow investigation of manyobjects, we have the opportunity to place new constraints on the nature andevolution of AGNs. In this contribution we present the results obtained byworking on multi-frequency data and we discuss their relations with theavailable optical spectra. We compare our findings with the AGN Unified Modelpredictions, and we present a revised technique to select AGNs of differenttypes from other line emitting objects. We discuss the multi-frequencyproperties in terms of the innermost structures of the sources.

Models of emission line profiles and spectral energy distributions to characterize the multi-frequency properties of active galactic nuclei