D.R. Horton is the largest homebuilding company in the United States, constructing and selling homes across 36 states. The company's core business is homebuilding, generating most of its revenue from the sale of single-family detached homes, with additional revenue from attached homes, land, and lots. D.R. Horton also operates in the rental market, with both single-family and multi-family rental properties, and provides financial services like mortgage financing and title insurance.