In a script, you have the option to insert details or notes about the script. These notes and details are entered as comments, or lines having # as their first non-whitespace character. Comments are ignored by the script interpreter.
Note: A # character is interpreted as the beginning of a comment only if it is the first non-whitespace character on a line. If the # appears later in the line, it has no special significance.
# This is a comment
# This is also a comment
123 # This is not a comment because '#' is not the first non-whitespace character in the line