Answer:
Sales to customers on account.
Step-by-step explanation:
Sales to customers is usually done in two ways; Cash and credit.
In the accrual system of accounting, sales is recognized in the books whether cash has been collected or not.
When a sale is done in credit, it is said to have been done on accounts and the entries recorded would be credit sales and debit accounts receivables. The debit entry would have been to cash account if cash had been collected.
Hence credit sales refers to Sales to customers on account.