What document helps in maintaining a physical record of transactions?

Numbered receipts serve as a robust solution for maintaining a physical record of transactions. They provide a systematic way to document purchases or services rendered, where each receipt is sequentially numbered to prevent duplication and ensure accountability. This numbering helps in tracking individual transactions efficiently and is particularly useful in audits or reconciliations, as it provides clear evidence of financial exchanges.

Additionally, a receipt often contains detailed information such as the date, items purchased, amounts paid, and payment methods, making it an indispensable tool for record-keeping. This level of detail assists businesses and individuals in managing their finances, maintaining transparency, and addressing any disputes that may arise from the transaction.

Other options like digital invoices and transaction emails may not provide the same level of physical documentation necessary for certain record-keeping scenarios, while internal memos typically serve more for communication purposes rather than for detailing financial transactions. Thus, numbered receipts are the preferred choice for ensuring accurate and reliable physical transaction records.