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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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For discussions about tags on the main site, including anything from creation, over merging, synonym creation, deletion, and related operations.
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considered on-topic for
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For discussions/ support about editing questions and answers. Common guidelines, best practices, and frequent mistakes may be discussed with this tag. Disagreements between editors are also within the…
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a JavaScript engine for displaying mathematics in general, and (through the mhchem package) chemical formulas and equations in particular on Chemistry Stack Exchange.
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or is not well suited for Chemistry.SE.
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For use when inquiring about a particular question e.g. inquiring about a specific question’s suitability for this site.
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Discusses the layout design of this site, mainly CSS/styling issues.
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third-party extension for MathJax, for formatting chemical formulas and equations in particular on Chemistry Stack Exchange, via the \ce command. Read more here -…
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The reasons leading to the votes of moderators to close the question.
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For questions about the wording of titles for questions on the main site.
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Questions relating to down-voting posts.
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frequent phrases that are overly broad and non-descriptive, therefore they don't add anything of value to a question (title). This tag should be used to address such words and how to avo…
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For questions about the chat rooms and chat functionality, room rules, accepted practices, chat sessions etc.
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For questions about the bounty system, which allows users to spend some of their reputation in order to draw more attention to a question.