Inside the database of a credit reporting agency...

To know what a credit file is you must first understand what a database is and how it functions. A database is structured data that is accessible in a variety of ways. There are about a dozen different kinds of databases, and the credit reporting agencies use one of the most common types, a relational database. At the most basic level, a relational database is an electronic database that arranges information into one or more tables with a unique identifier for each row. In a credit reporting agency's database, each row represents a single consumer while each column contains bits of information attributed to the column header (such as Social Security number or date of birth).