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UDPUDP packets are used where delivery is not guaranteed. That sounds a bit odd, doesn't it? Of course delivery of most packets is highly likely, its just that some of it may not get there. What use is that? well, for some information like video and audio, some loss of data can be tolerated. The advantage of UDP is that the sender and recipient agree on a constant data rate. This means that you don't have to run the link as fast as you can, which is the natural design of tcp/ip. UDP based protocols are going to become increasingly common in future, as the convenience of being able to set a fixed data rate between two points is worth the hassle of coping with missed bits of the message.
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