Taglibs are wonderful components available since J2EE 1.3. They enable you, as developer: to refrain from using too much scriptlets (free-form Java code) in your Java Server Pages,to have a library of reusable components that can be distributed to all your projects. Both are very important in the enterprise as of now. For example, as an architect, you can disallow the use of scriptlets altogether and then provide taglibs to restrain what can be done on the page.