This document discusses class action lawsuits. It defines a class action as a lawsuit brought by a large group of people collectively, or a suit in which a class of defendants is being sued. It notes that class actions originated in the US and are governed by the Federal Rules of Civil Procedure. For a class action to be certified, the class must meet requirements such as commonality, adequacy, numerosity, and typicality. The document also outlines the procedures for filing and settling a class action and notes some of the advantages of the class action format.