A URL shortener is a tool that converts long web addresses into shorter, more manageable links. This is particularly useful for sharing links on social media platforms or in text messages, where character limits may apply. By using a URL shortener, users can create concise links that redirect to the original, longer URLs. These services work by generating a unique identifier for each long URL, which is then appended to the short domain name. When someone clicks on the shortened link, they are redirected to the original web page. Popular examples of URL shorteners include Bitly and TinyURL.