HTML forms are used for submitting data back to a script on the server for data processing. When a form is submitted, the data in the form fields is passed to the server in the form of name-value pairs. Server-side scripts, which can be written in several different languages, are used to process the incoming data and return a new HTML page to the browser. The page returned to the browser could be anything from a "Thank you for registering" message or a list of search results generated from a database query.
The form processing occurs in the following sequences: