Why is it beneficial to use satellite launch vehicles made of more than on stage ?

Explanation

(i) Fuel in the launch vehicle forms the major part of the total weight of the launch vehicle .
(ii) Thus, the vehicle has to carry large amount of weight in the form with it .
(iii) For the launch vehicles with more than one stage , the fuel in the first stage is used to give the initial thrust to the vehicle. After this fuel is exhausted , the empty fuel tank along of the vehicle. This reduces weight of the vehicle step by step.
Hence , it is beneficial to use satellite launch vehicles made of more than one stage.