> For the complete documentation index, see [llms.txt](https://happybara.gitbook.io/streamly/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://happybara.gitbook.io/streamly/concepts.md).

# Concepts

- [What is a Stream?](https://happybara.gitbook.io/streamly/concepts/stream.md): The core functional units of Streamly
- [What is a Request?](https://happybara.gitbook.io/streamly/concepts/request.md): A discrete piece of work that is submitted in a Stream
- [What is an Integration?](https://happybara.gitbook.io/streamly/concepts/integration.md): A connection between Streamly and a tool
- [What is a service user?](https://happybara.gitbook.io/streamly/concepts/service-user.md): A user account with appropriate permissions that does not belong to a real person