Someone on quora asked:
When, why and where servlets, jsp, jstl, el come into picture?
What exactly are you asking?
Servlets are used for request processing.
JSP is a template language for generating web pages (they can be used to generate any kind of HTTP response)
JSTL is a standard tag library available for use inside JSP. EL is an expression language also used inside JSP.
If you need a primer on this stuff, I’ve found the Head First Servlets and JSP book to be reasonably good.
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