Creditors provide goods, services or credit. There are two distinct types of creditors, original creditors and debt buyers.
original creditor: Your original creditor is the firm that provided you with goods, services or credit and seeks to collect monies it claims are now owing by you.
debt buyer: Unpaid accounts are an asset--and like any asset, an original creditor may sell one or more customer accounts on which monies are owing. A debt buyer is an entity which purchases an unpaid account. It is possible for a debt which your original creditor has sold to a debt buyer to be resold one or more times.