A postage label is a sticker or tag that indicates the amount of postage paid for sending a letter or package through the mail. It typically includes information such as the sender's and recipient's addresses, a barcode, and the postage amount. Postage labels can be purchased at post offices or printed at home using online services. These labels are essential for ensuring that mail is delivered correctly and efficiently. They help postal services like the United States Postal Service (USPS) or Royal Mail track and manage shipments. Using a postage label also helps prevent delays in delivery due to insufficient postage.