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JavaScript Object Notation, or JSON for short, is a lightweight data-interchange format which may prove to be a viable alternative to XML for IT developers. The purpose of a data-interchange format is to transfer information between potentially incompatible technologies. For example, the sender may be a Java application running on Unix and the receiver could be a Visual Basic program running on Windows. In this instance one would require a standardized format to send the data because the applications could not communicate directly with each other. Even if they could, using a protocol such as TCP/IP or FTP, the data structures would have be to be defined somewhere.