IPv6 address types | unicast | multicast | anycast | link local

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There are three major categories of IPv6 addresses:
* Unicast
* Multicast
* Anycast
*
If you remember the types of network communication in IPv4 are Unicast, Multicast and Broadcast.
There is no broadcast in IPv6.

Unicast is the term used to describe communication where a piece of information is sent from one point to another point.
Unicast is a one-to-one type of network communication.
In this case there is just one sender, and one receiver.
For Example
1) Browsing a website. (Web server is the sender and your computer is the receiver.)

Multicast is the term used to describe communication where a piece of information is sent from one point to a set of other points.
Multicast is a type of communication where multicast traffic addressed for a group of devices on the network.
IPv6 multicast traffic are sent to a group and only members of that group receive the Multicast traffic.
In this case there is may be one sender, and the information is distributed to a set of receivers
or example, TV channels.
The multicast server generate only one stream of data and that stream is replicated to different devices, who are interested in that data traffic.

Anycast is a type of IPv6 network communication in which IPv6 datagrams from a source are routed to the nearest device (in terms of routing distance) from a group servers which provide the same service.
Anycast, also known as IP anycast, is a networking technique that allows for multiple machines to share the same IP address.
Every nodes which provide the same service are configured with same Anycast destination address.
Based on the location of the user request, the routers send it to the machine in the network that is closest. .