Planet.osm is the OpenStreetMap data in one file: all the nodes, ways and relations that make up our map. A new version is released every week. It's a big file (on 2024-12-01, the plain OSM XML variant takes over 1994.0 GB when uncompressed from the 144.8 GB bzip2-compressed or 78.0 GB PBF-compressed downloaded data file).
