We would use servlets in a number of different situations to create dynamic content.

Use servlets to conduct online commerce.

Servlets can provide thin-client connectivity to a large enterprise application. Since servlets reside on the server, they can act as a middleware gateway to legacy systems.

Servlets can provide controlled access to a number of different multi-user applications, such as chat servers, news and file services, discussion databases, and search engines. User services that do not currently have Web interfaces can be bridged using servlets that provide protocol support to those services. Servlets can directly communicate with applets on browsers.

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