Postal rates refer to the fees charged by postal services for sending letters and packages. These rates can vary based on factors like the weight of the item, its size, and the distance it needs to travel. For example, sending a small letter within the same city usually costs less than shipping a large package across the country. Different countries have their own postal rates, which are often set by their respective postal services, such as the United States Postal Service or Royal Mail. Additionally, there are options for faster delivery, which may come with higher rates, allowing customers to choose the service that best fits their needs.