In Perl, what is the difference between a .pm (Perl module) and .pl (Perl script) file?

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What is the Difference between .pm (Perl module) and .pl (Perl script) file?

Please also tell me why we return 1 from file. If return 2 or anything else, it's not generating any error, so why do we return 1 from Perl module?

perl-module perl
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