The Class Action Fairness Act (CAFA) is a federal law enacted in 2005 that expands federal jurisdiction over class action lawsuits and mass tort cases. It aims to provide a fairer process for resolving such cases, ensuring that they are heard in federal courts rather than state courts when certain criteria are met, such as diversity of citizenship and a minimum amount in controversy. This act plays a critical role in the sources of civil procedure law and the framework for class actions, as it addresses concerns about potential abuses in state court systems and promotes more consistent standards in handling class actions.