It is the easiest way to reliably load streaming data into data stores and analytics tools. It can capture, transform, and load streaming data into Amazon S3, Amazon Redshift, Amazon Elasticsearch Service, and Splunk, enabling near real-time analytics with existing business intelligence tools and dashboards you’re already using today. 

Fully managed, No shards, elastic scalability, near real time delivery (~60 seconds latency, because Firehose has a Buffer in megabytes with different ranges depending on the destination).

Producers send data to Firehose and data is automatically delivered to other services( data is not stored and you don't need to implement Consumer applications).

Destinations:

Redshift

S3

Elasticsearch

Splunk

Datadog

MongoDB

NewRelic

HTTP Endpoint

Firehose can invoke Lambda to transform incoming source data and transform it ( before delivering to its destination ) - for example for formats other than JSON.