Much of the IP data is not useful, beyond the protocol and source/destination address information.
其中除了协议和来源/目标地址信息，其余许多 IP 数据是没有用的。
When an application wants to send data to another host, UDP builds a header that includes a source port, a destination port which provides an address for delivering messages.
当应用软件向另一主机发送数据时，UDP协议生成一个数据头，包括源端口，目的地端口。这些端口提供为送达信息所需要的地址。
It's an efficient way to deliver IP data package from one source to more destination, send the copy of information to a group of address, to all the recipients at the same time.
IP组播是面向组接收者的有效数据通信方式，利用一种协议将IP数据包从一个源传送到多个目的地，将信息的拷贝发送到一组地址，到达所有想要接收它的接收者处。
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