When hydrochloric acid (HCl) is neutralized by sodium hydroxide (NaOH), the salt formed is sodium chloride (NaCl).

Here's the chemical equation for the reaction:

HCl (aq) + NaOH (aq) → NaCl (aq) + H₂O (l)

This reaction is a classic example of an acid-base neutralization reaction. The hydrogen ions (H+) from the acid react with the hydroxide ions (OH-) from the base to form water (H₂O). The remaining ions, sodium (Na+) and chloride (Cl-), combine to form the salt, sodium chloride.