A class action is a legal proceeding where one or several plaintiffs sue on behalf of a larger group, impacting all members of the class. The history of class actions includes their roots in group litigation in the UK and their evolution in the US, particularly with the introduction of federal rule 23 in 1938, which allows for collective lawsuits. While class actions facilitate legal claims against large entities, they also have drawbacks, such as limited benefits for individual members and loss of control over the case.