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Its really cool to see this question and to answer it after a whole year, however I don't like to see wrong answer and just swing by.
GWT is basically a Java Web toolkit not application or framework it has been created by Google, and now it being contributed by other vendors like Vaadin, Red Hat Jboss and other software engineers.
You can basically create a web application using only java where your java code will be compiled into javascript css and html, also you can create your layout using xml. Its a great tool and a very cool java web framework are built on the top of it like Vaadin7 and Errai.
GWT is Google Web Toolkit.It is an application that permits to code in Java a web application.
The result of your java code will be converted in html pages and also in javascript.You will find a big difference between GWT1.0 and2.0. The most common used in our days if GWT2.0 and2.5.
Now it also supports JDK7 and8.
I hope you will better understand what is GWT
