Credit Notes are the amount of an invoice that isn't refunded but recorded in the database such that it is redeemed by the client in their next invoice/payment. This is created when any paid invoice is canceled for certain reasons then this is not refunded instead it is converted into a credit note which can be redeemed on the next payment.
Credit notes are added in this section from the invoice page by converting a paid invoice into a credit note from there and is recorded on the Credit Notes page directly in a tabular manner where details like Credit note number, Invoice number, Name, Total Amount, Credit Note date, Credit Note Status, and some extra options for editing, deletion, etc. are available. It is accessed offline by exporting it using the option available on the top left corner of the data table.
Individual credit notes can be viewed easily by clicking on the view option. It includes details of the two parties, credit note number, invoice number, date, and billing details as mentioned on the invoice previously. These details are later redeemed in the next invoice and the status of the credit note is changed depending on it.