.PM File Extension

Module containing Perl functions that can be referenced and used by Perl programs; may be one of two different types:

1) Traditional - defines subroutines and variables for the function referencing the module to import and use.

2) Object-oriented - functions as a class definition and is accessed through method calls.

Some Perl modules may offer traditional and object-oriented functionality.

Bitmap image format generated by the Unix program "xv," an interactive image manipulation program for the X Window System; also a used by IBM's OS/2 Presentation Manager.