postage stamp

A postage stamp is a small piece of paper affixed to a letter or package to show that the sender has paid the postal service fee. It acts as proof of payment, enabling the item to be delivered through the mail system. Stamps typically feature images, designs, or symbols and are issued by postal authorities. Once attached, the stamp often gets canceled by the postal service to prevent reuse. Overall, stamps facilitate efficient and verifiable mailing while also often serving as collectible items.