Consider a credit memo as a document in which the due amount of the customer for refund is remaining. This amount can reduce the price of the purchase or refund to the customer.
Backend
To see credit memos in your Magento store, go to Sales ➤ Credit Memos, you will redirect to the “Credit Memos” page.
Here you can see all the details related to credit memos like Date, Order, Created Date, Name, Status, and Refund Amount.