In keyword research for a wiki page, what distinguishes a valuable 'long-tail keyword' from an irrelevant one?

In keyword research for a wiki page, a valuable 'long-tail keyword' is distinguished from an irrelevant one by its *high relevance to the specific page content and its ability to attract a qualified audience seeking precise information*, as opposed to general or unrelated traffic. Long-tail keywords are longer, more specific phrases that people use when they are closer to making a decision or finding a specific a....