

A double displacement reaction is a one in which there are two reactants reacting, and both the reactants undergo dissociation resulting in the exchange of the moieties between the reacting groups to form new products.
it can be understood as, AB + CD → AD + CB
Examples,
NaOH + HCl → NaCl + H2O
AgNO3 + NaCl → AgCl + NaNO3
