Question

why do we need political party function

Answer 1

It is a way to mobilize the voters to support common sets of interests, concerns, and goals. The primary role of the political party is to fix the political agenda and policies. So, each party tries to persuade people by claiming their policies are better than those of other parties.

Answer 2

We need political parties because of the functions that the political party's play:- 
1)They contest in Elections.
2)They put forward different policies and programmes. 
3)They play a decisive role in the making of Laws.
4)They form and run the government.
5)Play the role of Opposition in to the Ruling Party