Question

what is meant by the collection letters?​

Answer 1

A collection letter (also known as dunning letter) is a notification sent in writing, informing a consumer of his past due payments. Debt collection letters' function is to remind the debtor of his delinquent payment owed to a creditor. ... A collection letter is to be sent, when debtor's invoice has become past-due.

Answer 2

letter collection or collection of letters consists of a publication, usually a book, containing a compilation of letters written by a real person. Unlike an epistolary novel, a collection of letters belongs to non-fiction literature