• Modules provide extra functionality
• CGI provides a CGI scripting interface
• Data::Dumper prints out data structures like hashes
• DBI provides a database interface
• Error provides simple error handling
• Using modules
• use modules at the top of your program
• Some modules take a parameter list
• perldoc gives information about installed modules

         use CGI qw(:standard);
         print header,
               start_html('A Simple Example'),
               h1('A Simple Example'),
               p("Hello, World"),
               end_html;