Notes on 2 of the above answers:
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A Perl programmer who doesn't want to create <samp>EXPORT</samp> lists will use the simpler form
use Module ();
Also, note the subtle differences between require "Name" and require Name...
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There's a difference between use and require (on the one hand) and do (on the other).
<samp>do</samp> essentially reads and evals the file; like any <samp>eval</samp>, it returns the value calculated. This value may be logically true, or it may not be; it doesn't matter.
<samp>require</samp> (and therefore <samp>use</samp> too) attempts to ensure some semantics are loaded. This might fail! So a required (or used) module is required (sorry) to return logical true if successful, or logical false if not. Thus the need to end those files with "1;" (or any other truth!). It's not needed if just <samp>do</samp>ing something (e.g. if loading a configuration file (unsafely)).
