The postal system is a network that facilitates the sending and receiving of letters and packages. It includes various services such as mail collection, sorting, and delivery. Postal systems operate at local, national, and international levels, ensuring that items reach their intended destinations efficiently. In many countries, the postal service is managed by a government agency, which sets regulations and standards for mail delivery. People can send items through different methods, including standard mail, express services, and registered mail, each offering varying levels of speed and security.