Java Servlets are programs that run on a Web or Application server and act as a middle layer between requests coming from a Web browser or other HTTP client and databases or applications on the HTTP server.
Some terminologies about Java and server:
JDK: This is needed if we wanted to just compile standard java programs.
JRE: This is run time environment under which a java program compiled above and execute.
JSE: Java Standard Edition. It is basically JDK+JRE.
JEE: This is ‗Enterprise version‘ of Java, which meant support for server-side technologies (Servlets and JSP).
WWW: Designed by Tim Berners Lee in 1991, It is an information space where documents and other web resources are identified by URL, interlinked by HyperText links and accessible by internet.
TCP: Defines how to establish and maintain a network conversation between client and server. It works with IP.
URL: Uniform Resource Locator. HTTP: It is the underlying protocol used by the World Wide Web and defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various commands(Stateless Protocol).
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