Fill in the actual address, such as Room **, No. **, XX Road, XX District, XX City, and then fill in the zip code of the address. The zip code is composed of Arabic numerals. It is a special code representing the post office that delivers mail. It is also the postal communication code for mail machine sorting. It is an essential tool for realizing postal modernization. The ultimate goal is to improve the speed and accuracy of your letters during the delivery process. Therefore, be sure to write the zip code when sending letters and parcels. The code for residents and units within the delivery range.