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非结构化补充数据业务(USSDUnstructuredSupple-mentaryServiceData)是一种基于GSM网络的新型实时交互式数据业务，它是在GSM的短消息系统技术基础上推出的一种全新业务。USSD业务是移动运营商为挖掘GSM网络潜力而开发的新业务，引入该业务对原有的系统结构影响很小，运营商的投入成本不大。从移动终端来看，目前GSMphase2手机均能支持USSD业务，这对USSD业务的引入也提供了一个很好的应用环境。
Unstructured Supplementary Data Service (USSD Structured Service-mentaryServiceData) is a new type of real-time interactive data service based on the GSM network. It is a brand new service based on the GSM short message system technology. The USSD service is a new service developed by mobile operators to tap the potential of GSM networks. The introduction of this service has little impact on the original system structure, and the input cost of operators is small. From the mobile terminal point of view, the current GSMphase2 mobile phones can support the USSD business, the introduction of the USSD business also provides a good application environment.