Major purpose of this presentation is to discuss on Hydrogen Fuel Cells. Hydrogen fuel cells are a type of electrochemical cell and it generate electricity by reduction and oxidation reactions within the cell. HFCs operate like batteries, although they require external fuel and they are a thermodynamically open system. Generally use hydrogen as a fuel, oxygen as an oxidant, a proton exchange membrane as an electrolyte, and emit only water as waste. Finally discuss on how do Hydrogen Fuel Cells work and Problems regarding this systems.