> For the complete documentation index, see [llms.txt](https://osm-tw.gitbook.io/learnosm-tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://osm-tw.gitbook.io/learnosm-tw/0600-12-31-osm-data.md).

# osm data

OpenStreetMap is a massive database of geographic data, and it's all open and free. But how do you access the data? In this section we'll discuss in greater detail how OSM data is organized, and how you can access and use the data that you are interested in.