  Transit and radial velocity surveys have deeply explored the population of
extrasolar giant planets, with hundreds of objects detected to date. All these
detections allow to understand their physical properties and to constrain their
formation, migration, and evolution mechanism. In this chapter, the observed
properties of these planets are presented along with the various populations
identified in the data. The occurrence rates of giant exoplanets, as observed
in different stellar environment by various surveys are also reviewed and
compared. Finally, the presence and properties of the giant exoplanets are
discussed in the regards of the properties of the host star. Over this chapter,
the observational constraints are discussed in the context of the dominant
planet formation, migration and evolution scenarios.
