* Redox reactions involve the transfer of electrons. In this reaction, there is no change in the oxidation states of the elements involved.
* Sodium (Na) remains in the +1 oxidation state. It's +1 in NaOH and +1 in NaCl.
* Chlorine (Cl) remains in the -1 oxidation state. It's -1 in HCl and -1 in NaCl.
* Hydrogen (H) remains in the +1 oxidation state. It's +1 in HCl and +1 in H₂O.
* Oxygen (O) remains in the -2 oxidation state. It's -2 in NaOH and -2 in H₂O.
Since there's no change in oxidation states, this reaction is a neutralization reaction, where an acid (HCl) and a base (NaOH) react to form salt (NaCl) and water (H₂O).