What is Kafka Streams and what is it used for?

Kafka Streams is a library for real-time stream processing on top of Apache Kafka. It allows creating applications that read, process, and write data to Kafka topics with minimal latency.

It is used for:

• Aggregating and filtering events in real-time.
• Enriching data, merging multiple streams.
• Implementing complex event processing logic without the need to write separate services.

For example, in a project, I used Kafka Streams to count clicks on different product categories in real-time to update website statistics without delays.