Which of the following services is designed for processing streaming data?

Amazon Kinesis is specifically designed to handle real-time streaming data. It provides the necessary tools to collect, process, and analyze streams of data as they arrive. Kinesis enables developers to build applications that can continuously ingest data, allowing for real-time analytics and insights. It supports various data sources and can handle large volumes of data, making it ideal for scenarios where timely data processing and analysis are crucial, such as with log and event data, sensor data, and IoT applications.

Other services, while useful for data storage and processing, do not specialize in streaming capabilities. For example, Amazon S3 is primarily a storage service for unstructured data, Amazon EMR is designed for processing large data sets using Hadoop and other frameworks but is not focused on real-time streaming, and Amazon RDS is a relational database service that is optimized for transactional data but not for continuous data streams.