Dynamic Multipoint Virtual Private Network - Definition from the Hotspot Shield Glossary
This is a form of secure network that transmits data between different offices or sites without the need for the data to pass through a corporation’s headquarter VPN network or router.
Traditional VPN’s will operate in a star topology with all nodes connecting to a central hub; a DMVPN is created using a mesh topology where all nodes can connect to each other regardless of location or proximity to the central hub.
Dynamic Multipoint Virtual Private Networks are run using VPN routers and Firewall Concentrators. DMVPN networks are beneficial as they mean traffic can travel independently of a central hub which in turn decreases the bandwidth requirements and increases the redundancy of a network (If one node or the central hub goes down, the other nodes will still be able to connect to each other).