APPENDIX A
Understanding Web 
A
Applications
A web application is a collection of web pages that interact with visitors, 
with each other, and with various resources on a web server, including 
databases. Before you start building your own web applications, you should 
be familiar with the concepts discussed in this chapter. 
The chapter contains the following topics:
About web applications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  217
How a web application works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Authoring dynamic pages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  224
Choosing a server technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  226
Web application terminology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227
About web applications
A web application is a website that contains pages with partly or entirely 
undetermined content. The final content of a page is determined only 
when the visitor requests a page from the web server. Because the final 
content of the page varies from request to request based on the visitor's 
actions, this kind of page is called a dynamic page.
Web applications are built to address a variety of challenges and problems. 
This section describes common uses for web applications and gives a 
simple example. 
217






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