A post office is a building where people go to send letters, packages, and postcards to others, and where mail carriers pick up the mail they'll deliver to homes and businesses. When you want to mail a birthday present to your cousin in another state, you take it to the post office, where workers weigh it, sell you the right amount of postage, and add it to the system that will get it to your cousin's door.

Post offices have been essential to civilization for thousands of years. In ancient Rome, the government ran a postal system to send messages across the empire. In early America, Benjamin Franklin served as the first Postmaster General, helping connect the colonies through mail delivery. Before telephones and the internet, the post office was how people stayed in touch with distant friends and family, how businesses sent contracts and payments, and how news traveled between towns.

Today, post offices still handle millions of pieces of mail every day. Workers sort letters and packages, sell stamps, and help people track important deliveries. While email and text messages now handle much of our communication, post offices remain vital for sending physical items: birthday gifts, important documents, packages from online orders, and anything else that needs to travel from one place to another.