doc: Update README.md (#20355)

Author: yingjunwu

README.md

@@ -39,7 +39,7 @@
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-RisingWave is the world's most advanced streaming database engineered to provide the <i><b>simplest</b></i> and <i><b>most cost-efficient</b></i> approach for <b>processing</b>, <b>analyzing</b>, and <b>managing</b> real-time event streaming data. It provides both a Postgres-compatible [SQL interface](https://docs.risingwave.com/sql/overview) and a DataFrame-style [Python interface](https://docs.risingwave.com/python-sdk/intro).
+RisingWave is the world's most advanced event stream processing platform engineered to provide the <i><b>simplest</b></i> and <i><b>most cost-efficient</b></i> approach for <b>processing</b>, <b>analyzing</b>, and <b>managing</b> real-time event streaming data. It provides both a Postgres-compatible [SQL interface](https://docs.risingwave.com/sql/overview) and a DataFrame-style [Python interface](https://docs.risingwave.com/python-sdk/intro).
 
 RisingWave can <b>ingest</b> millions of events per second, continuously <b>join and analyze</b> live data streams with historical tables, <b>serve</b> ad-hoc queries at low latency, and <b>deliver</b> fresh, consistent results wherever needed.
 
@@ -57,11 +57,10 @@ To learn about other installation options, such as using a Docker image, see [Qu
 ## When is RisingWave the perfect fit?
 RisingWave is the ideal solution for:
 
-* Managing real-time data sources like Kafka streams, database CDC, and more.
-* Executing complex, on-the-fly queries, including joins, aggregations, and time windowing.
-* Interactively and concurrently exploring consistent, up-to-the-moment results.
-* Seamlessly delivering results to downstream systems.
-* Processing both streaming and batch data with a unified codebase.
+* **Ingestion**: Ingest millions of events per second from both streaming and batch data sources.
+* **Stream processing**: Perform real-time incremental data processing to join and analyze live data streams with historical tables.
+* **Serving**: Persist data and serve ad-hoc queries with single-digit millisecond latency.
+* **Delivery**: Deliver fresh, consistent results to data lakes (e.g., Apache Iceberg) or any destination.
 
 
 ## In what use cases does RisingWave excel?