• Increasingly, authors (of WWW pages) want to generate WWW pages dynamically.
• Maybe the author has a WWW form to collect data from the visitor and wants to return a WWW page that depends on that data.
• One way of generating information dynamically is to get the webserver to execute some code that generates HTML.
• Possibilities include:
  • a CGI script,
  • a PHP script,
  • an Active Server Page,
  • some code written in Java (a servlet),
  • a JavaServer page,
  • and so on.