URL shortening is a technique used to create a shorter version of a long web address, or URL. This is done by using a service that generates a unique, compact link that redirects to the original, longer URL. Shortened links are easier to share, especially on platforms with character limits, like Twitter. These shortened URLs often include a domain name from the shortening service, followed by a unique identifier. This makes them convenient for sharing in emails, social media, or printed materials. However, users should be cautious, as shortened links can sometimes obscure the destination, potentially leading to unsafe sites.