How can IIT-BHU be an IIT and a part of BHU at the same place ?

6 institutes, 14 faculties, and 140 departments comprise the whole of Banaras Hindu University. Before 2012 IIT-BHU was known as IT (Institute of Technology) and hence was under the administrative control of BHU itself. After 2012, IT BHU gained the status of IIT and became an autonomous institution. Since it is located inside the BHU campus, it is popularly called IIT-BHU. Otherwise, it can be called IIT-Varanasi too. It runs according to the IIT-council rules but doesn’t have a separate VC. The VCs are the same as that of BHU. Another major difference between these two institutes is in the mode of admission. BHU conducts its own admission test while IIT admission takes place through JEE mains and advance, GATE & GPAT.