Final answer:
TransUnion is a major national credit bureau in the United States that collects and maintains credit information on individuals and businesses.
Step-by-step explanation:
The major national credit bureau in the United States is TransUnion. TransUnion is one of the three main credit bureaus in the U.S., alongside Experian and Equifax. It collects and maintains credit information on individuals and businesses, which is then used by lenders and other organizations to evaluate creditworthiness and make informed decisions.
TransUnion operates in several countries, including the United States, Canada, and South Africa. It provides credit reports, credit scores, and other related services to help individuals manage their credit and make informed financial decisions.