Simple English Wikipedia is Wikipedia designed for children and adults learning English. Just like Wikipedia, the content on Simple English Wikipedia is generated by users. The difference between Wikipedia and Simple English Wikipedia is that articles written using basic English words and phrases.
I learned about Simple English Wikipedia through my Twitter network. The link was passed around a bunch of times, but I think the first person in my network to post it was BudtheTeacher.
Applications for Education
Simple English Wikipedia could be a good reference page for elementary school students or older ESL/EFL students. Many teachers are still reluctant to let their students use Wikipedia, but as I’ve seen and heard David Warlick point out, Wikipedia articles come with disclaimers while most textbooks and encyclopedias do not. You can read more of my opinion about Wikipedia here.