What service allows for real-time processing of large data streams?

The service that enables real-time processing of large data streams is Kinesis Data Streams. It is specifically designed for collecting, processing, and analyzing continuous streams of data records in real-time. This capability makes it ideal for applications that need to process data as it arrives, such as data from IoT devices, website clickstreams, and financial transactions.

Kinesis Data Streams can handle high throughput and low latency, allowing developers to build applications that respond immediately to new data. This is crucial in scenarios where timely insights and actions are needed, such as fraud detection or real-time analytics.

In contrast, other services mentioned are not focused on real-time stream processing. For instance, AWS S3 is primarily an object storage service designed for storing and retrieving data, rather than processing it in real-time. AWS CloudTrail and AWS Config are services that provide logging and monitoring of AWS account activity and resource configurations, respectively, but they do not facilitate real-time stream processing capabilities.