Postal codes are a series of letters, numbers, or both that are used to identify specific geographic areas for the purpose of sorting and delivering mail. They help postal services, like the United States Postal Service or Royal Mail, efficiently route packages and letters to their intended destinations. Each code corresponds to a particular region, city, or even a single address. In many countries, postal codes vary in format. For example, in the United States, they are typically five digits long, while in Canada, they consist of alternating letters and numbers. These codes are essential for ensuring timely and accurate mail delivery, making them an important part of modern communication.