j2ee is generaly a java 2 enterprise edition
as java is not so old
no java is coming in three version
j2se
j2ee
j2me(micro edition)

j2ee is just a specfication of building a robut ,secure enterprise application
lets take the example of bank as u know that tody u can perform all the operatio
frm net .
so to perform these operation u need a lot of api
s j2ee
provide a bundle of all the api and runtime environment
these api help in achieving lot of services