A URL shortener is a service that turns a long web address into a shorter link that redirects to the original destination. This is useful for QR codes, social posts, and printed material where space is limited, because a shorter link is easier to copy, share, and fit into a small design.
In cyber security, URL shorteners matter because they hide the final destination from immediate view. That can reduce a user’s ability to spot suspicious domains, making it easier to disguise phishing pages, malware downloads, or tracking links behind a trusted-looking redirect. Defenders treat shortened links carefully by expanding them before allowing access, scanning the destination, and logging redirect chains. Used well, they improve usability; used badly, they create a trust gap between the visible link and the actual site a user reaches.