In a Chapter 13, you make one payment to the Chapter 13 trustee which is distributed amongst your creditors.
The creditors may be paid 10 cents on the dollar. They may be paid back everything that is owed to them. It may be possible that the general unsecured creditors may be paid nothing, each situation is different.
I explain to my clients one can compare a Chapter 13 bankruptcy to a loan consolidation where a payment is made to a trustee who then distributes that money to your creditors.
Your creditors must work with the bankruptcy court and cannot continue to attempt to collect on their debts except through the bankruptcy itself. Debt still owed at the end of your Chapter 13 case may be discharged.