What is a Custom Tag?
A custom tag is a user-defined JSP language element. When a JSP page containing a custom tag is translated into a servlet, the tag is converted to operations on an object called a tag handler. The Web container then invokes those operations when the JSP page's servlet is executed.
Custom tags have a rich set of features. They can
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Be customized via attributes passed from the calling page.
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Access all the objects available to JSP pages.
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Modify the response generated by the calling page.
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Communicate with each other. You can create and initialize a JavaBeans component, create a variable that refers to that bean in one tag, and then use the bean in another tag.
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Be nested within one another, allowing for complex interactions within a JSP page.
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