This document provides an introduction to financial fraud, defining it as fraud involving a financial account or transaction. It focuses on retail payment card and deposit account fraud committed against innocent consumers (third party fraud) or by account holders themselves (first party fraud). Financial fraud is a serious and costly problem due to its negative economic impacts, with direct costs to victims and institutions as well as indirect costs like reduced consumer trust. Efforts are needed across multiple stakeholders to effectively prevent, detect and prosecute this evolving threat.