Na2SO3 (aq) + 2 AgNO3 (aq) + 2 KOH (aq) → 2 Ag (s) + Na2SO4 (aq) + 2 KNO3 (aq) + H2O (l)
This is an oxidation-reduction (redox) reaction:
SIV - 2 e- → SVI (oxidation)
2 AgI + 2 e- → 2 Ag0 (reduction)
Na2SO3 is a reducing agent, AgNO3 is an oxidizing agent.
This is a precipitation reaction: Ag is the formed precipitate.