An extension is a common term meant to convey an increased functionality (i.e. extending functionality) and is used to refer to code that defines additional [Tcl] procs either by way of [package] and Tcl [script]s or the Tcl [C] [API].

It is fairly common to use the term "extension" to mean only things that are '''not''' pure [Tcl].

An extension may define new actions, new [widget]s, new processing types, etc.

** See Also **

   * [Extensions for Tcl and Tk]
   * [extension example],
   * [extension language]


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