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The Advanced Virgo detector has contributed with its data to the rapid growthof the number of detected gravitational-wave signals in the past few years,alongside the two LIGO instruments. First, during the last month of theObservation Run 2 (O2) in August 2017 (with, most notably, the compact binarymergers GW170814 and GW170817) and then during the full Observation Run 3 (O3):an 11 months data taking period, between April 2019 and March 2020, that led tothe addition of about 80 events to the catalog of transient gravitational-wavesources maintained by LIGO, Virgo and KAGRA. These discoveries and the manifoldexploitation of the detected waveforms require an accurate characterization ofthe quality of the data, such as continuous study and monitoring of thedetector noise. These activities, collectively named {\em detectorcharacterization} or {\em DetChar}, span the whole workflow of the Virgo data,from the instrument front-end to the final analysis. They are described indetails in the following article, with a focus on the associated tools, theresults achieved by the Virgo DetChar group during the O3 run and the mainprospects for future data-taking periods with an improved detector.

Virgo Detector Characterization and Data Quality during the O3 run