What products are formed during the electrolysis of a concentrated aqueous solution of NaCl?

The product of electrolysis of concentrated aqueous sodium chloride is sodium hydroxide, hydrogen gas and chlorine gas.

The following reaction is obtained as a result,

$\mathrm{NaCl}\to {\mathrm{Na}}^{+}\left(\mathrm{I}\right)+{\mathrm{Cl}}^{-}\left(\mathrm{I}\right)$

At cathode: reduction of $2{\mathrm{Na}}^{+}\left(\mathrm{I}\right)+{\mathrm{e}}^{-}\to \mathrm{Na}\left(\mathrm{I}\right)$

At anode: oxidation of $2{\mathrm{Cl}}^{-}\left(\mathrm{I}\right)\to {\mathrm{Cl}}_2\left(\mathrm{g}\right)+2{\mathrm{e}}^{-}$

Net Reaction is written as  $2{\mathrm{Na}}^{+}\left(\mathrm{I}\right)+2{\mathrm{Cl}}^{-}\left(\mathrm{I}\right)\to 2\mathrm{Na}\left(\mathrm{I}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$