A postage stamp is a small piece of paper that you stick on an envelope or package to show that you've paid for sending it through the mail. Each stamp has a specific value, which helps postal services like the United States Postal Service determine how much to charge for delivery. Stamps often feature images of famous people, landmarks, or symbols that represent a country or culture. When you buy a postage stamp, you can send letters and packages to friends and family around the world. The stamp is a key part of the mailing process, ensuring that your mail gets to its destination safely and efficiently. Without postage stamps, sending mail would be much more complicated!