What is the meaning of file name extension?

noun

  • A string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename.
    • usage: "most applications provide extensions for the files they create"; "most BASIC files use the filename extension. BAS"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). file name extension. Retrieved September 21, 2026, from http://smartdefine.org/file_name_extension/definitions/1276166
ChicagoWordNet. 2010. "file name extension" http://smartdefine.org/file_name_extension/definitions/1276166 (accessed September 21, 2026).
HarvardWordNet 2010, file name extension, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/file_name_extension/definitions/1276166>.
MLAWordNet. "file name extension" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/file_name_extension/definitions/1276166>