What is brine? how did Sodium Hydroxide from brine solution? give reaction

Brine is a salty solution.

Sodium hydroxide, NaOH, is also known as lye orcaustic soda. Electrolysis of concentrated sodium chloride solutions (brine) produces chlorine gas, hydrogen gas and aqueous sodium hydroxide. Cl2 (g) is produced at the anode (positive electrode). H 2 (g) and NaOH (aq) are produced at the cathode (negative electrode).