Photon Multiplicity Detector (PMD) is a detector used in the measurement of the multiplicity and spatial distribution of photons produced in nucleus - nucleus collisions. In short form, it is denoted by PMD. It was incorporated in the WA93 experiment. The funding for research and development of the design of PMD was done by the Department of Atomic Energy (DAE) and the Department of Science and Technology (DST) of the Government of India. The detector was constructed in the collaboration of Variable Energy Cyclotron Centre in Kolkata, Institute of Physics in Bhubaneswar and group of universities at Chandigarh, Jaipur and Jammu.