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We describe the execution and data reduction of the European SouthernObservatory Large Programme "Quasars and their absorption lines: a legacysurvey of the high-redshift universe with VLT/XSHOOTER" (hereafter `XQ-100').XQ-100 has produced and made publicly available an homogeneous and high-qualitysample of echelle spectra of 100 QSOs at redshifts z~3.5-4.5 observed with fullspectral coverage from 315 to 2500 nm at a resolving power ranging from R~4000to 7000, depending on wavelength. The median signal-to-noise ratios are 33, 25and 43, as measured at rest-frame wavelengths 1700, 3000 and 3600 Angstrom,respectively. This paper provides future users of XQ-100 data with the basicstatistics of the survey, along with details of target selection, dataacquisition and data reduction. The paper accompanies the public release of alldata products, including 100 reduced spectra. XQ-100 is the largestspectroscopic survey to date of high-redshift QSOs with simultaneous rest-frameUV/optical coverage, and as such enables a wide range of extragalacticresearch, from cosmology and galaxy evolution to AGN astrophysics.

XQ-100: A legacy survey of one hundred 3.5 < z < 4.5 quasars observed with VLT/XSHOOTER