The foreach loop allows you to do something to each value in an array.
A quick example is below:

@numbers=(1,7,3,8,9);
foreach $number(@numbers){ #makes $number point to array value; 
   $number++;              #$number is incremented by 1 which is refle
+cted inside the actual array;
}

#Now if we print out all the numbers they should reflect our changes
#ie @numbers is now equal to (2,8,4,9,10);

foreach(@numbers){ #notice here we don't specify a variable so Perl us
+es its default: [perlman:perlvar|$_]
   print "$_,";    #we print the changed numbers separated by commas
}

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