When you say one of the sources is streaming, is the streaming data coming from your internal product or from an external source?

Streaming data can originate from either internal or external sources. Internal sources are typically data produced by your own applications or services, such as logs, metrics, or user actions, which are written to Kafka topics. External sources might be third‑party APIs, partner feeds, or public data streams that you ingest into Kafka via connectors or custom producers. The key difference is ownership and control: internal streams are fully under your control, while external streams may have rate limits, authentication, or data format constraints that you need to handle.