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Further information
Many chemical substances give out heat when they react together. These reactions are known as exothermic. One of the most obvious examples is combustion when fuel burns (is oxidised) in air. The fuel could be a gas (eg natural gas), a liquid (eg petrol), or a solid (eg coal or wood).
Other examples of exothermic processes include neutralisation (reacting an acid with a base), polymerisation (converting a monomer such as ethylene into polyethylene) and nuclear decay.
Control of an exothermic reaction is difficult as reaction rates increase exponentially as the temperature rises. If the heat cannot be removed by cooling, the reaction can 'run away' causing safety issues with excess temperature or pressure. A dramatic example can be seen by following Runaway: Explosion at T2 Laboratories.
In 2011 there was a major disaster at the Fukushima Daiichi nuclear power plant in Japan when the tsunami damaged the cooling system and the reactors over heated. See Wikipedia.