Implicit objects are a set of Java objects that the JSP Container makes available to developers in each page. These objects may be accessed as built-in variables via scripting elements and can also be accessed programmatically by JavaBeans and Servlets.

Implicit objects will be automatically instantiated under specific variable names. Furthermore,each object must adhere to a specific Java class or interface definition.

We have already met one of these objects already - the out object in which we used the println() method to add text to the output stream.

The first three are rarely used. The application, session and request implicit objects have the additional ability to hold arbitrary values. By setting and getting attribute values these objects are able to share information between several JSP pages.