Anycast DNS service
Anycast DNS is a powerful network routing technique that improves your website's performance and availability. It guarantees visitors are connected to the nearest DNS server, resulting in faster response times and improved website availability.
Anycast DNS is a simple concept - you can reach a single destination following many different roads. Instead of having all the traffic go down one route, Anycast DNS utilizes multiple locations that receive queries to the network, but in different geographical locations. The objective here is for the network to find the shortest path for a user to a particular DNS server.
The definition, from a purely technical standpoint, states "Anycast DNS is a network addressing and routing methodology, in which datagrams from a single sender are routed to the topologically nearest node in a group of potential receivers."