Definition: XDR

(1) (EXtreme Dynamic Range) Apple's high-end desktop monitor. See Pro Display XDR.

(2) (EXternal Data Representation) A data format developed by Sun that is part of its networking standards. It deals with integer size, byte ordering, data representation, etc. and is used as an interchange format. Different systems convert data to XDR for sending and from XDR upon receipt.

(3) (XML-Data Reduced) An XML schema language from Microsoft prior to the W3C XML schema. XDR was a working schema in 1999 as part of Microsoft's BizTalk initiative. XDR supports data typing and XML namespaces. See XML schema and XML.

(4) (eXtended Detection and Response) Network protection that exceeds regular endpoint detection and response (EDR). XDR collects and analyzes data from multiple sources, including internal as well as external traffic. See behavior detection and SIEM.

(5) (EXtreme Data Rate) A dynamic RAM chip technology from Rambus, Inc. that is the successor to Rambus' RDRAM memory. Used in Sony's PlayStations 2 and 3 and various consumer electronics devices, the second generation XDR2 provides nearly 30 Gbytes/sec of bandwidth to a single device. See RDRAM.