Link cloaking is the practice of masking a long, complex destination URL behind a shorter, cleaner URL. This technique is used in affiliate marketing to hide affiliate tracking parameters, in email marketing to present cleaner links, and in social media to avoid URLs that look spammy or untrustworthy.
Technically, a short URL redirects to the actual destination, which may contain affiliate IDs, UTM parameters, or other tracking codes. The user sees only the clean short URL, while the full destination URL with all its parameters is handled transparently during the redirect.
Link cloaking raises ethical considerations. While hiding ugly URLs improves aesthetics, deliberately obscuring the destination to mislead users crosses into deceptive territory. Deceptive cloaking that tricks users into visiting unexpected sites may breach platform policies.
From an SEO perspective, Google Search Central asks site owners to mark links that are advertisements or paid placements with the rel="sponsored" attribute; it notes that rel="nofollow", previously recommended for these links, is still acceptable, though sponsored is preferred.