New – Route 53 Traffic Flow | AWS Official Blog
aws.amazon.com/blogs/aws/new-route-53-traffic-flow
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
In order to make it easier for you to build and run cloud-based applications that embody these characteristics, we introduced a new Traffic Flow feature for Amazon Route 53 last week. You can use this feature to build a routing system that uses a combination of geographic location, latency, and availability to route traffic from your users to your cloud or on-premises endpoints.