Domain hack, explained
Domain hacks usually rely on country-code extensions whose letters complete a word, such as .be for Belgium, .it for Italy or .ly for Libya. They became popular as short links and vanity addresses: YouTube and Reddit use youtu.be and redd.it for sharing, and del.icio.us was an early bookmarking brand built on one. The term has nothing to do with security.
Their value is narrow. Buyers are mostly companies that already own the main brand and want a short link, so resale often depends on a single buyer. Each domain hack also inherits its ccTLD's rules, including eligibility, local law and the registry's discretion: in 2010 the .ly registry took down vb.ly, citing Libyan law on adult content. Before buying, read the registry's policies, and say the name aloud, since people who hear it may type .com instead.
Example. A news brand that owns its full .com buys a matching domain hack to use in short links on social posts.
Go deeper The Types of Domain Names That Sell
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Education, not financial, legal or tax advice. Domain investing is speculative and most domain names never sell. Read the disclaimer.