Answer: Addition Reaction
Step-by-step explanation:
Addition or Insertion of any molecule or atoms to unsaturated compounds gives addition product.
During this unsaturated compounds gets converted into saturated compound or Multiple bonds (sp2 ,SP hybridisation) gets converted into single bond (sp3 hybridisation).
Example:
Addition of H2 to alkene(unsaturated compound) gives addition product called alkane(saturated compound)
Ethene + Hydrogen ----> Ethane
CH2=CH2 +H2 -------> CH3-CH3