Class action is a legal procedure of a considerable group of people to take joint actions against a single defendant. In this form of action, one or more people representing while also being a member of a class, take an action for themselves and on behalf of others, regarding a common claim among the members of the class. Although the members of the class have no active role in the jurisdiction, they are bound to its result. Nowadays, class action as a form of aggregating action enjoys a special status in the States legal system. Class action provides a group of people, who does not individually have an interest in following up their trivial claims, with the opportunity to entitle their rights. The efficiency of the judicial system will enhance through this form of taking actions and seems to be economic. The prerequisites of class action have been explained in details in rule 23 of the Federal Civil Procedure Law and Class Action Fairness Act 2005. Class actions are taken in the several fields such as Consumer Rights, Anti-trust, Employment Law, Civil Law, and Environmental law, to mention a few.