> For the complete documentation index, see [llms.txt](https://1ambda.gitbook.io/practical-data-pipeline/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://1ambda.gitbook.io/practical-data-pipeline/05-data-application/untitled.md).

# 5.1 데이터 서비스