What a credit bureau is
A credit bureau (also called a credit reporting agency) is a company that gathers information about how you borrow and repay money, keeps it in a file, and sells that file to lenders as your credit report. In the U.S., three dominate: Equifax, Experian, and TransUnion.
They don't lend you money or decide your applications — they just collect the data. Lenders read it and make their own decisions.
Where their information comes from
Your banks, card issuers, and lenders send the bureaus monthly updates: your balances, credit limits, and whether you paid on time. Public records and collection agencies can add items too.
Because reporting is voluntary, not every lender reports to all three — which is why your three reports can look slightly different.
Why three bureaus matter to you
A lender might pull just one bureau, or all three. If an account or an error appears on only one, it can still cost you — so it pays to check all three, not just one.
For newcomers, this is key: the sooner your on-time payments reach the bureaus, the sooner you have a usable U.S. credit file.
Your rights with the bureaus
You're entitled to a free report from each bureau at annualcreditreport.com, and you can dispute anything inaccurate directly with the bureau — for free — under federal law.
You can also freeze your file at each bureau to block new-account fraud, at no cost.
The three credit bureaus quietly decide what every lender sees about you — so knowing how they work, and checking all three, is basic financial self-defense. Subefy lets you watch all three in your language and explains what each line means. Credit disputes are always free.