Aluminothermic reactions are exothermic chemical reactions using aluminium as the reducing agent at high temperature.  The process is industrially useful for production of alloys of iron. The most prominent example is the thermite reaction between iron oxides and aluminium to produce iron itself:
: FeO  +  2 Al   →   2 Fe  +  AlO
This specific reaction is however not relevant to the most important application of aluminothermic reactions, the production of ferroalloys.  For the production of iron, a cheaper reducing agent, coke, is used instead via the carbothermic reaction.