Products of electrolysis on salt water
Used for the disinfection for swimming pool water. Also used in industry as a reactant.
Used as a fuel, especially for rockets.
The solution left behind can be used to produce wood pulp and bleach.
Wood is made into cellulose because NaOH removes everything but the cellulose, which is the main ingredient for pulp and paper.
Cl2 (g) + 2NaOH (aq) → NaCl (g) + NaOCl (aq) + H2O (l)
Chlorine + sodium hydroxide → sodium hypochlorite + water