A postal code is a series of letters, numbers, or both, assigned to specific geographic areas to facilitate the sorting and delivery of mail. Each code helps postal services identify the destination of a package or letter, ensuring it reaches the correct location efficiently. Postal codes vary by country; for example, in the United States, they are known as ZIP codes, while in Canada, they use a combination of letters and numbers. Postal codes are essential for various services beyond mail delivery, including online shopping and emergency services. They help businesses determine shipping costs and delivery times, while also assisting emergency responders in locating addresses quickly.