Apache Flink Overview Flink is a distributed stream processing engine for real-time analytics. Unlike batch-first systems (Spark), Flink is stream-first — it processes events as they arrive with millisecond latency. Supports exactly-once semantics, stateful processing, and event time windowing. Instructions Step 1: PyFlink Setup Step 2: Stream Processing Step 3: Flink SQL Guidelines - Flink is stream-first; Spark is batch-first with streaming added. Choose Flink for sub-second latency. - Use event time (not processing time) for accurate windowed aggregations. - Watermarks handle late-arriving…