There are a few ways to explain this, as you didn't provide much detail. One short example could be:

use CGI;

use strict;
use warnings;

my $query = new CGI({fungsil=>"123", foo=>"bar"});
print $query->param('fungsil'), "\n";
print $query->param('foo');
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This will print:

123  #the value for parameter fungsil
bar
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