Also called category killer
Category-defining domain, explained
These names sit at the top of the aftermarket. DNJournal's all-time list of cash domain sales includes Voice.com at $30,000,000 in 2019 and Chat.com at $15,500,000 in 2023, and AI.com's $70 million purchase, reported in February 2026, is the largest publicly reported domain sale. The value comes from instant trust and recall, type-in traffic and lower marketing cost; the buyers are category leaders and well-funded entrants.
The label is easy to misuse. A true category-defining name is the term people actually use, in the form they use it, in the dominant extension; a longer phrase or a near-synonym is not. The buyer pool is tiny, so these names can take years to sell, and pricing rests on the few companies able to pay. The common mistake is calling any keyword .com a category killer and pricing it like one.
Example. Chat.com defines a category; a five-word phrase about chat apps describes one corner of it and is priced accordingly.
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Education, not financial, legal or tax advice. Domain investing is speculative and most domain names never sell. Read the disclaimer.