UDP 是User Datagram Protocol的简称， 中文名是用户数据报协议，是OSI(Open System Interconnection，开放式系统互联) 参考模型中一种无连接的传输层协议，提供面向事务的简单不可靠信息传送服务，IETF RFC 768是UDP的正式规范。(UDP is User Datagram Protocol, Chinese is the name of the user datagram protocol, OSI (Open System Interconnection, open system interconnection reference model) in a connectionless transport layer protocol, provides a simple transaction oriented unreliable information transfer service, IETF RFC 768 is a formal specification of UDP.)