Web apps are multitier applications (sometimes referred to as n-tier applications). Multitier applications divide functionality into separate tiers (i.e., logical groupings of functionality). Although tiers can be located on the same computer, the tiers of web apps often reside on separate computers. Figure 30.3 presents the basic structure of a three-tier web app.
The information tier (also called the data tier or the bottom tier) maintains data pertaining to the application. This tier typically stores data in a relational database management ...
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