what is odata,json and soap?

hello friends i am confused and unable to link the concepts 开发者_C百科in odata,json and soap? how json protocol different from odata?

why do we need json when we already have odata? why odata takes json format and atom format and in which situation?

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OData and SOAP are protocols whereas JSON is a data format (defines the syntax and semantics of data representation).

Protocols might or might not enforce the use of specific data formats (I think normally they do).

For example, OData uses JSON, SOAP uses XML.

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Wikipedia is your friend if you want to read about this technologies in more detail.

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SOAP is a protocol specification for exchanging structured information in web

Json is a markup language like HTML , XML use to send data...

OData is Web protocol for querying and updating data..