When a Web server receives a client request for static web pages (usually files with an extension .htm or .html), it looks for the requested page, and simply responds to the client with the contents. However, when dynamic content is requested, the behavior of the server needs to be different: In this case, a program has to be run on the server machine that interprets the parameters of the request and generates the content accordingly in web application development
To enable the server to distinguish between regular requests for static pages and requests for dynamic content, the server needs to be made aware of which requests should map to a program. This is usually done through a server plug-in. This plug-in is a small interface that tells the server which requests are dynamic (e.g. all pages that end with .cgi or .jsp), and what program to forward these requests to. A popular way of generating dynamic content in the past was the Common Gateway Interface (CGI). The CGI environment instantiates a new child process on the server to handle each request i.e. runs a program that generates the output dynamically.
This method, however, is very resource intensive. Creating a the new runtime environment, initializing it and destroying it after use are overhead tasks that can weigh heavily when a Web server receives thousands of requests per day.
A large number of simultaneous requests could even cause the server to crash due to memory restrictions. Servlets offer a much lighter weight approach to handling many client requests. Although the servlet interface definition is based on CGI, it processes requests differently. A single program running on the server, a so-called Servlet Engine or Servlet Container handles all requests. Instead of creating a new process for each request, the Servlet Engine uses Java’s multithreading capabilities to generate the dynamic page within the Servlet Engine’s main process.
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