In a web application, the user's browser functions as a client.

Thin Client

The heavy-lifting is done by code on the server side. Web applications follow the client-server model in general. Some examples of web applications include Google Calendar, Zimbra, and Office Outlook Web Access.

Rich Internet Application (RIA)

These applications offer a rich amount of interaction possibilities using their GUI. Rich internet applications tend to be more alike desktop applications than static web-pages. A RIA for example allows to interact using drag and drop, 3D effects animations and other media.

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