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Perhaps the most common usage of charcoal nowadays is in barbeques. It can be found in three forms: lump charcoal, charcoal briquettes and extruded charcoal. Lump charcoal is less processed and therefore produced less ash than briquettes. It tends to produce more heat but burns out more quickly than briquettes. Briquettes are produced by the compression of charcoal with other substances which are then bound together. They often include additives such as paraffin or petroleum to help their ignition. There is also extruded charcoal, which is produced by pressing and shaping raw or carbonised wood. No binding agent is required as the process itself causes enough heat and pressure to bind the charcoal together. Lump charcoal or briquettes are the most commonly used forms of charcoal in the family barbeque.