A postal system is a network that facilitates the sending and receiving of letters and packages. It includes various services such as mail collection, sorting, transportation, and delivery. Postal systems operate on local, national, and international levels, ensuring that items can reach their destinations efficiently. Most postal systems are managed by government agencies, like the United States Postal Service (USPS) in the United States or Royal Mail in the United Kingdom. These organizations provide various services, including standard mail, express delivery, and registered mail, catering to different needs and budgets.