The majority rule is used in many democracies, in decision-making. Constituted basically constituted by fifty percent.
Advantages: The decision-making is clear an quick. It can resolves disputes in a easy way, and the minority will still make part of the group. It can helps to protect the minority rights in settings with deliberation.
Disadvantages: About the disadvantages, the majority rule may be right and good, but is not fair, is tyrannical. When the majority is achieved the minority is treated in a meaningless way.