Electronic stamp, also known as automatic stamp (ATM), is a kind of postage paid voucher to meet the needs of postal automation. According to the postage face value required by users, the computer-controlled automatic ticket vending machine stamps the face value on the pre-printed and commemorative disc-shaped blank stamp paper, and then cuts it into individual stamps to be "spit out" for sale. Electronic stamps include three elements: memory, face value and design. They don't have a date, number or the name of the post office. It can be pasted at any time after purchase, and the post office must use the postal datestamp when receiving and sending, which is essentially different from the postage machine stamp. Early electronic stamps had no adhesive, and later they were coated with adhesive for convenience. Most electronic stamps have no perforations or only two semicircular locating grooves at the upper and lower ends, but electronic stamps issued by a few countries and regions have perforations like traditional stamps. For example, electronic stamps issued by the United States, Japan and Taiwan Province Province of China have perforations on two sides. In addition, some countries and regions have issued electronic stamps with their own series of patterns. For example, the China Special Administrative Region began to issue electronic stamps on the zodiac from 1987 (Year of the Rabbit) to 1998 (Year of the Tiger), and has formed a series of electronic stamps on the zodiac.