I travel all around the world, but always stay in my corner. What am I?

The solution to this clever riddle lies in a small, adhesive piece of paper that embarks on incredible journeys. This item is affixed to an envelope or package, literally staying in one fixed spot, or "corner," throughout its entire voyage. Despite its stationary position on the mail, it traverses vast distances, crossing continents and oceans, always accompanying its parcel to its destination.

This humble item is, of course, a postage stamp. Its primary function is to serve as proof that the sender has paid the necessary fee for the delivery of their mail. Before the widespread use of stamps, postal systems were often cumbersome, with recipients frequently having to pay for mail upon delivery. The introduction of the adhesive postage stamp in the mid-19th century, notably with Great Britain's Penny Black in 1840, revolutionized mail services, making them more efficient, affordable, and accessible to everyone.

Beyond their practical purpose, stamps offer a fascinating glimpse into history, art, and culture. Each tiny square or rectangle often features intricate designs, commemorating historical events, celebrating national heroes, showcasing local flora and fauna, or promoting important causes. This rich variety has made them highly collectible, a hobby known as philately, attracting enthusiasts worldwide who appreciate their beauty, rarity, and the stories they tell. They are silent witnesses to countless messages and connections made across the globe.