When a single accident or product causes injury to multiple people. those people may form a class action lawsuit. A class action lawsuit is a single lawsuit in which a group of people are represented collectively. Common types of class action lawsuits are lawsuits against the manufactures of prescriptions, medical devices, or automobiles. If you are part of a class action lawsuit, you will likely be contacted. You do not have to join a class action lawsuit, and have the right to opt out and pursue a claim on your own. Your attorney can advise you regarding which is best.