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Web application

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An application delivered over the World Wide Web. Web applications are popular due to the ubiquity of the web browser as an application client.

Though many variations are possible, a web application is commonly structured as a three-tiered application. In its most common form, a web browser is the first tier, an engine created using some dynamic web content technology (e.g., CGI, PHP, or Java servlets) is the middle tier, and a database is the third tier.

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