The German eROSITA Consortium (eROSITA-DE) makes public the first six months of the SRG/eROSITA all-sky survey (eRASS1) data whose proprietary rights lie with the German eROSITA consortium. Data rights are split by Galactic longitude (l) and latitude (b), with a division marked by the great circle passing through the Galactic poles (l,b)=(0,+90);(0,-90) and the Galactic Center SgrA* (l,b)=(359.94423568,-0.04616002): data with -0.05576432 l >179.94423568 degrees (Western Galactic hemisphere) belong to eROSITA-DE. The Western Galactic hemisphere observations were released to the public on 31 January 2024. DR1 consists of 20626.5 square degrees, which have a variety of effective exposure values, ranging from ∼100 seconds in the Ecliptic equator to more than 10,000 seconds close to the Ecliptic pole in the 0.6—2.3 keV energy band. eROSITA-DE releases calibrated event lists in the 0.2—10 keV energy band, images, exposure maps, background maps, and sensitivity maps as well as flux upper limits in different energy bands. These data products are organised in separate sky fields of 3.6x3.6 degrees. Furthermore, source spectra and light curves for selected (bright) targets are released. In the archive data, the products are arranged in directories named by the sky tile declination number (DDD), with subdirectories of the right-ascension number (RRR). Inside those are the results for different analysis chains (EXP, DET, SOU and UPP). EXP contains the main event file and images in each band. DET contains the exposure maps in each band and source detection products. SOU contains the source products. The upper limit products are inside UPP. Please note that source products are only generated for the higher signal to noise sources. For a more detailed description of the data types, please refer to eROSITA-DE:DataRelease1:eSASS4DR1_DataProductsDescription.