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The Advanced Virgo detector has contributed with its data to the rapid growthof the number of detected gravitational-wave (GW) signals in the past fewyears, alongside the two Advanced LIGO instruments. First during the last monthof the Observation Run 2 (O2) in August 2017 (with, most notably, the compactbinary mergers GW170814 and GW170817), and then during the full Observation Run3 (O3): an 11-months data taking period, between April 2019 and March 2020,that led to the addition of about 80 events to the catalog of transient GWsources maintained by LIGO, Virgo and now KAGRA. These discoveries and themanifold exploitation of the detected waveforms require an accuratecharacterization of the quality of the data, such as continuous study andmonitoring of the detector noise sources. These activities, collectively named{\em detector characterization and data quality} or {\em DetChar}, span thewhole workflow of the Virgo data, from the instrument front-end hardware to thefinal analyses. They are described in details in the following article, with afocus on the results achieved by the Virgo DetChar group during the O3 run.Concurrently, a companion article describes the tools that have been used bythe Virgo DetChar group to perform this work.

Virgo Detector Characterization and Data Quality: results from the O3 run