Short links are the public-facing output of a URL shortener. They consist of a host (the shortener's domain, such as `1url.at`) and a slug (the path segment that uniquely identifies the redirect). Slugs can be auto-generated random strings for maximum density, or human-chosen custom slugs for readability and brand recall. Length matters because every additional character reduces the scannable area of a printed QR code, eats into the 160-character SMS limit, and crowds out supporting copy in a tweet. Short links inherit the reputation of the host that serves them: a respected short domain gains click-through rate, while a domain flagged by security products suppresses deliverability across the entire service. Short links also decouple the public-facing identifier from the destination, so marketers can change where a link points without reprinting materials or re-sharing posts. The cost of this flexibility is indirection — every short link is a dependency on an outside service and adds a DNS lookup plus one HTTP round-trip before the visitor reaches the real page. High-quality shorteners minimize latency by running at the network edge and by keeping the redirect response under a few hundred bytes.