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More Strings << Comments >> Subroutines
HTML, JavaScript, and SSI all have comment tags. PERL follows the trend and also allows you to enter comment areas. This is great considering some scripts can become rather indepth. Having a couple comment lines greatly helps during editing and documenting.

To comment a line out in PERL, the # symbol is used.
# This line is commented out.
# We can describe what the next part of the script does.
# And so forth and so on.

The reason behind using comments is usually to help in future editing. It's best to enter in descriptive comments rather than general unclear ones.

Good :
# calculate a cost-of-living adjustement and
# raise the emplyee's salrary by that amount:
$salary += $salary * $col_percentage;

Bad :
# Increment salary by salary times col_percentage:
$salary += $salary * $col_percentage;

Get the idea?
More Strings << Comments >> Subroutines
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