---
metadata:
  - name: generator
    content: Diplodoc Platform v5.52.0
alternate:
  - https://ydb-platform--ydb.viewer.diplodoc.com/en/concepts/streaming-query.md
  - https://ydb-platform--ydb.viewer.diplodoc.com/ru/concepts/streaming-query.md
  - href: en/concepts/streaming-query/index.md
    type: text/markdown
    title: Markdown version
  - href: ../../llms.txt
    type: text/markdown
    title: llms.txt
sourcePath: en/core/concepts/streaming-query/index.md
---
> **Documentation Index:** Fetch the complete configuration index at https://ydb-platform--ydb.viewer.diplodoc.com/en/llms.txt

# Streaming data processing

This section describes the key concepts of stream processing ( [stream processing](https://en.wikipedia.org/wiki/Stream_processing)) in YDB:

- [Streaming queries](https://ydb-platform--ydb.viewer.diplodoc.com/en/concepts/streaming-query/streaming-query.md) — a type of query for continuous processing of incoming events. Sources and sinks of data, delivery guarantees, limitations, and query management are described.
- [Watermarks](https://ydb-platform--ydb.viewer.diplodoc.com/en/concepts/streaming-query/watermarks.md) — a mechanism for tracking the progress of event processing over time.