MITx is the massive open online course (MOOC) program at Massachusetts Institute of Technology. A constituent program of MIT's Office of Digital Learning, MITx produces MOOCs from MIT departments and faculty. Prior to 2U's acquisition of edX, MITx courses appeared there. After the acquisition, courses appeared on MIT's own site. MITx also supports residential experiments with scalable learning technologies and research on digital learning. MOOCs offered through edX by MITx are open-enrollment and free to take. In September 2012, edX and MITx introduced the option to receive an ID verified certificate on some courses.