A QFX file is a data file used by Intuit's Quicken personal finance software. It is a standardized format for exchanging financial data between financial institutions and Quicken. QFX files contain transaction information, such as deposits, withdrawals, payments, and transfers, along with account details like account numbers and balances. This format allows users to easily import transaction data from their banks, credit card companies, and other financial institutions directly into Quicken, eliminating the need for manual data entry. The QFX format is a more secure and reliable alternative to the older OFX (Open Financial Exchange) format, as it incorporates enhanced security features. It streamlines the process of managing personal finances by providing a convenient way to keep track of financial transactions and account balances within the Quicken software environment. QFX files are typically downloaded from a financial institution's website or accessed through Quicken's online banking features.