What is the term used for code that resides on a server to help process web form input?

The correct term for code that resides on a server to help process web form input is "Server-side script." This type of script is executed on the server before the content is sent to the user's browser. It enables the processing of data submitted through web forms, such as validating inputs, interacting with databases, and generating dynamic content. The server-side script can handle various tasks such as saving user inputs to a database, performing calculations, or sending emails based on the form input.

In contrast, client-side scripts are executed in the user's browser and typically manage user interactions with the webpage but do not process form submissions directly on the server. Database scripts specifically refer to scripts that directly interact with database systems and are not general-purpose scripts. Executable scripts can refer to various types of scripts that can be executed, but they do not specifically denote scripts meant for web form processing. Thus, "Server-side script" is the most accurate term in this context.