A franking machine comes with a Royal Mail licence. When you want to pay for postage on your outgoing mail, you can use your franking machine to print a postage payment (frank mark) along with company logo & message onto your letter, packet or parcel instead of using stamps. Your franking machine will weigh the item and print the correct postage amount based on the Royal Mail rates, depending on the Royal Mail service (i.e. 1st class, 2nd class, signed for etc.) that you require. Franked postage rates are cheaper than stamps.