Hydrogen can be a great energy source since it can be made from plentiful water and used in many industrial processes. It can replace oil and coal in industries like steelmaking. Hydrogen can be turned into different fuels like methanol. Making hydrogen from water is doable. Hydrogen, just like electricity, is a high-quality but pricey energy source. To make hydrogen more popular, we need good tech and policies. Low-temperature fuel cells, like PEM fuel cells, are a good tech to use hydrogen in cars and power stations. Fuel cells make electricity without using up the cell materials. They work the opposite of making hydrogen from water. Fuel cells are good at converting chemical energy into electric power.