When a less reactive element gets displaced from a more reactive element in a chemical reaction, it is known as a displacement reaction. The less reactive element turns pure in this type of reaction. 

Example: 

Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)

• In a displacement reaction, metal substitutes metal and non-metal substitutes non-metal.
• Iron is more reactive than sulphate. Copper sulphate (CuSO₄₎ is in the solution. When the iron dissolves in the copper sulphate solution, it forms a brown copper coating on its surface.
• The reaction forms iron sulphate and solid copper.