Unicast address: identifies a single interface:
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An IPv6 packet sent to a single Unicast address is delivered to the interface identified by that address.
Multicast address: identifies group/set of interfaces that belong to a group of nodes.
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An IPv6 packet delivered to a Multicast address is delivered to multiple interfaces.
Anycast address: identifies a set of interfaces that belong to a group of nodes.
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An IPv6 packet destined for an Anycast address is delivered to one of the interfaces identified by the address.
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Anycast address is used by routers. The closest router using the address gets the packet.
