A credit bureau is a company that collects information about an individual's credit history. This information is then used to create a credit report, which is a detailed record of an individual's credit history. Lenders use this information to assess an individual's creditworthiness when they apply for a loan or credit card. There are three major credit bureaus in the United States: Experian, Equifax, and TransUnion. These bureaus collect and maintain information on millions of consumers, and their credit reports are used by lenders to help make decisions about whether to approve a loan or credit card application.