Party systems: One-party system: . In some countries, only one party is allowed to control and run the government. It is called one-party system. . We cannot consider one-party system as a good option because this is not a democratic option. . Any democratic system must allow at least two parties to compete in elections and provide a fair chance for the competing parties to come to power. Example: Communist Party of China. Two-party system: . In some countries, power usually changes between two main parties. . Here, only the two main parties have a serious chance of winning majority seats to form the government. Example: USA and UK. Multi-party system: . If several parties compete for power and more than two parties have a reasonable chance of coming to power, either on their own or in alliance with others, it is called a multi-party system. . The multi-party system often appears very messy and leads to political instability. . At the same time, this system allows a variety of interests and opinions to enjoy political representation. Example: India. Major Coalitions—NDA, UPA, Left Front.