What is enhanced fan out in Kinesis Data Streams, and why is it useful for multiple consumers?

Enhanced fan out gives each registered consumer its own dedicated two megabyte per second throughput pipe for every shard using a push based delivery mechanism, meaning multiple consumer applications can read the exact same stream simultaneously at full speed without competing for the shared two megabyte per second read throughput that would otherwise need to be divided among all consumers using the standard polling model.

aws kinesis register-stream-consumer --stream-arn arn:aws:kinesis:us-east-1:123456789012:stream/my-stream --consumer-name my-analytics-consumer