The Dark Energy Survey Data Release 2

We present the second public data release of Dark Energy Survey, DES DR2, based on optical/near-infrared imaging by Camera mounted 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile. DR2 consists reduced single-epoch and coadded images, a source catalog derived from associated products assembled 6 yr science operations. This includes wide-area survey covering ?5000 deg2 southern Galactic cap five broad photometric bands, grizY. has median delivered point-spread function FWHM g = 1.11'', r 0.95'', i 0.88'', z 0.83'', Y 090, uniformity with standard deviation < 3 mmag respect to Gaia G band, accuracy ?11 mmag, internal astrometric precision ?27 mas. The depth for 195 diameter aperture signal-to-noise ratio 10 is 24.7, 24.4, 23.8, 23.1, 21.7 mag. ?691 million distinct astronomical objects detected 10,169 image tiles size 0.534 produced 76,217 images. After basic quality selection, benchmark galaxy stellar samples contain 543 145 objects, respectively. These are accessible through several interfaces, including interactive visualization tools, web-based query clients, cutout servers, Jupyter notebooks. constitutes largest set date achieved precision.