Which service allows for real-time data streaming and analytics?

Amazon Kinesis is the service specifically designed for real-time data streaming and analytics. It enables users to collect, process, and analyze real-time, streaming data, allowing for timely insights and immediate reactions to information as it flows in. Kinesis provides capabilities such as data ingestion and processing in real-time, using various components like Kinesis Data Streams for collecting and processing large streams of data records in real-time, Kinesis Data Firehose for loading streams directly into data lakes and other storage services, and Kinesis Data Analytics for analyzing streaming data with SQL-like queries.

In contrast, Amazon Athena is primarily a query service that lets you analyze data stored in Amazon S3 using standard SQL but does not handle real-time streaming. Amazon S3 is an object storage service where data can be stored, including batch-processed data, but it does not inherently provide real-time data processing capabilities. Amazon EMR (Elastic MapReduce) is a cloud big data platform used for processing and analyzing large amounts of data using frameworks like Apache Hadoop and Spark, typically in batch processing scenarios rather than real-time streaming. Therefore, the unique features and capabilities of Amazon Kinesis make it the appropriate choice for real-time data streaming and analytics.