3 types :-
1. Unicast
One to one point.
2. Multicast
One to many points.
3. Broadcast
One to all points.
To make it simpler consider a class as an example :
A teacher is a point and each student is a point.
A teacher teaching in class is heard by all students, one to all - Broadcast.
A student was sleeping in class, teacher told that student to stand up, one to one - Unicast.
Some students failed in a test, teacher advicing the failed students to improve, one to many - Multicast.
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