An article has to be about a “notable” subject, otherwise it can be deleted.
There are various criteria required to meet the notability requirements, and it depends on the subject. But primarily, it needs to have multiple independent reliable sources of information about the subject.
See “[Wikipedia:The answer to life, the universe, and everything](https://en.wikipedia.org/wiki/Wikipedia:The_answer_to_life,_the_universe,_and_everything)”.
If an article doesn’t meet those standards, anyone can nominate it for deletion. If necessary, it goes to a public vote, to ultimately decide if it’s acceptable.
There’s lots of pages explaining it in more detail on Wikipedia, including “[Wikipedia:Notability](https://en.wikipedia.org/wiki/Wikipedia:Notability)”, and “[Your first article](https://en.wikipedia.org/wiki/Help:Your_first_article)”.
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