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Apache Flink is the de facto open-source standard for stateful stream processing, designed to run computations over unbounded, continuous data streams. It's used for building real-time data pipelines and event-driven applications because it provides low-latency processing, high throughput, and exactly-once consistency guarantees, which are critical for trustworthy, mission-critical systems.

Yes. Confluent Cloud is designed as a unified data streaming platform where Apache Kafka and Apache Flink are seamlessly integrated. Data must be in a Confluent Cloud Kafka topic to be processed by Flink. This tight integration is a core benefit, as it removes the need for custom connectors and provides a single, governed source of truth for all real-time data. However, Confluent Platform enables use of Flink with a variety of sources outside Apache Kafka.

Confluent Cloud provides a fully managed, serverless Flink service that eliminates the significant operational complexity of deploying, scaling, and securing open-source Flink. While open-source Flink is a powerful engine, Confluent provides a complete data streaming platform around it, including zero-config integration with Kafka, an integrated Schema Registry, enterprise-grade security, and a usage-based pricing model, allowing teams to focus on logic, not infrastructure.

Confluent Cloud provides several tools for cost management. The pricing is pay-as-you-go, based on CFUs consumed per minute, so you only pay for what you use. You can set configurable, hard spending limits on your compute pools to prevent budget overruns and monitor usage through the Metrics API to optimize your queries for cost-efficiency.