Specification :

used as the most common paint stripper on wooden objects.
used in conjunction with zinc for creation of the famous " Gold pennies" experiment.
is used in the refining of alumina containing ore ( bauxite) to produce alumina ( aluminium oxide) which is the raw material used to produce aluminium metal via the smelting process.
used in soap making ( cold process soap, saponification) .
Food uses of sodium hydroxide include washing or chemical peeling of fruits and vegetables
used in the home as a drain cleaning agent for clearing clogged drains.
used as a cleaner in breweries, where it is simply called " caustic" .