A postal card is a simple card you can mail without putting it in an envelope. One side has space for writing a short message, and the other side has room for the recipient's address and a postage stamp. Think of it like sending a note that anyone could read, since there's no envelope to keep it private.

Postal cards became popular in the late 1800s as a quick, inexpensive way to send brief messages. Before phones and text messages existed, people used postal cards to confirm appointments, send quick greetings, or share simple updates. A shopkeeper might send a postal card saying “Your order is ready for pickup,” or a grandmother might write “Arriving Tuesday at 3 p.m.” to let her family know when to meet her train.

The term can be confusing because people often use postcard to describe any mailable card, but technically a postal card is one issued or approved by the postal service, while a postcard might refer to decorated cards with pictures (like vacation souvenirs). In everyday conversation, though, most people use the words interchangeably. Today, postal cards have largely been replaced by email and text messages, but they remain useful for official notices and simple correspondence.