Multi-party system is basically not a system. In fact, it is a term which is used for there where are more than 2 active political parties. And India did not adopted this system but as their are so many religions and also the caste system so a group of people of a particular society or religion makes a political party and they don't want the ruling party to fulfill their demands and they also have a little ego and attitude because of which they say that they will themselves rule the government. And you know that there are more than 750 political parties in India. And basically if we notice, this system is not bad because there should be competition if someone want some good to happen. But in India there are too many parties that people sometimes get confused. And also the parties can't get enough votes or seats to form a government.
I hope you understand my view.