$foo::bar is a "package variable", sometimes referred to as a "global", although IMHO I prefer at least "package global", because the variable does belong to the package - see perlmod. our makes it so that the name $bar refers to $foo::bar in the lexical scope it is used. Outside of package foo;, you need to either refer to it by its full name $foo::bar, or you need to make a local alias to it, as for example is possible with Exporter; there are more ways to do it but these are the two I prefer depending on the situation. Here's an example for the latter:

foo.pm

package foo;
use warnings;
use strict;
use Exporter 'import';

our @EXPORT_OK = qw/$bar/;

our $bar = 42;

1;
[download]

script.pl

use warnings;
use strict;
use feature 'say';
use foo qw/$bar/;

say $bar;
[download]

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