What is a national red stamp?

A national red stamp is a postage stamp issued by the national postal service of a country for domestic mail, usually valid only within that country. These stamps typically bear the national emblem or flag, and are often printed with a red-colored ink to distinguish them from international stamps. National red stamps are used for mailing letters, postcards, and other small items within the country, and can be purchased at post offices, authorized outlets, and online through the national postal service's website. The cost of national red stamps varies depending on the country and the weight of the item being mailed.