JavaServer Pages (JSP) files are application building blocks coded to the Sun Microsystems JavaServer Pages (JSP) Specification. JSP files enable the separation of the Hypertext Markup Language (HTML) code from the business logic in Web pages so that HTML programmers and Java programmers can more easily collaborate in creating and maintaining pages.
The IBM extensions to the JSP Specification include JSP tags that resemble HTML tags making it easy for HTML authors to add the power of Java technology to Web pages, without being experts in Java programming.
JSP files support a division of roles: