Q: **How do I respond to 'What is X?' questions?**

A: If the question has a clear, single answer, then it is valid. For example: "What is a left coset?" is a "What is X?" question, but there is implied context. 

If the question lies without context whatsoever, leave a comment asking for more details about the asker's background, where they saw the term, etc. 

If the question has only subjective answers, [down vote?] / [vote to close?], and request the asker to more carefully consider what they intend to learn from replies to their question - and reword the question, making it clear what they expect in reply.


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Related: https://math.meta.stackexchange.com/questions/168/are-what-is-x-questions-acceptable