What type of address is used for communication with a single specific destination in IPv6?

Unicast is the type of address used for communication with a single specific destination in IPv6. When an IPv6 packet is sent as a unicast transmission, it is directed to one specific interface identified by its unique IPv6 address. This means that the packet is intended only for that particular device, allowing for a direct and efficient one-to-one communication.

In contrast, multicast addresses are designed for sending packets to a group of devices that are subscribed to a particular multicast address, while anycast addresses allow for reaching the nearest device in a group that shares the same address. Broadcast is not utilized in IPv6; instead, it has been largely replaced by multicast for one-to-many communications. Understanding these address types is fundamental for effective network design and operations in an IPv6 environment.