JSP scriptletA JSP scripting element containing any code fragment that is valid in the scripting language used in the JSP page.
JSP standard actionAn action that is defined in the JSP specification and is always available to a JSP page.
JSP tag fileA source file containing a reusable fragment of JSP code that is translated into a tag handler when a JSP page is translated into a servlet.
JSP tag handlerA Java programming language object that implements the behavior of a custom tag.
JSP tag libraryA collection of custom tags described via a tag library descriptor and Java classes.
JSR (Java Specification Request)Java Specification Request (JSR) is the actual description of proposed and final specifications for the Java platform.