The Quicken Interchange Format (QIF) is a legacy file format used to store financial data, including bank account transactions, investment portfolios, and budget information. Originally developed by Intuit for its Quicken personal finance software, the format is based on a simple ASCII text structure. Each entry in a QIF file is categorized by a specific character code, such as 'D' for date, 'T' for amount, 'P' for payee, and 'M' for memo, followed by the actual data. Because it is a plain text format, it is human-readable and relatively easy for developers to parse, which led to its widespread adoption across various financial management applications. However, QIF lacks robust security features and does not support modern banking standards like OFX (Open Financial Exchange), which is why it has been largely superseded by more secure and structured formats in contemporary banking software. Despite this, it remains a common format for exporting historical data from older financial systems or for importing data into personal accounting software that still maintains backward compatibility.