This video explains the feature of DHCP failover, which was introduced in Windows Server 2012 and is designed to ensure the continuous availability of DHCP services for network clients. This feature allows two DHCP servers to share scope and lease information, enabling one server to automatically assume service provision if the other becomes unavailable. The video contrasts DHCP failover with previous high availability methods, such as DHCP in a Windows failover cluster and Split scope DHCP, highlighting the simplicity and resilience of the new failover option.