GAIADR2 contains a local copy of the gaia_source table from the second data release from the ESA Cornerstone mission Gaia. It is provided for the convenience of users when cross-querying from our infrared (WSA, VSA), optical (OSA) and spectroscopic (GES) public survey data releases. For further details, see the Gaia DR2 online documentation and also the Gaia DR2 data model description.