Step-by-step explanation:
In a displacement reaction, more reactive element displaces less reactive element. Whereas in a double displacement reaction there is exchange of ions of two compounds.
For example,
![AgNO_(3)(aq) + NaCl(aq) \rightarrow AgCl(s) + NaNO_(3)(aq)](https://img.qammunity.org/2020/formulas/chemistry/middle-school/wm28epegmxfpealntoqalgvqhyubapgeqn.png)
This is a double displacement reaction as ions of both compounds
and NaCl are exchanged by each other.