A servlet is a server-side program written in the Java programming language that interacts with clients and is usually tied to a HyperText Transfer Protocol (HTTP) server. One common use for a servlet is to extend a web server by providing dynamic web content.
Servlets have an advantage over other technologies in that they are compiled, have threading capability built in, and provide a secure programming environment. Even web sites that previously did not provide servlet support, can do so now by using programs such as JRun or the Java module for the Apache web server.
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