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.

Type to find tags:
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Google's software stack for mobile devices. Please use the Android-specific tags such as [android-intent], not [intent]. For non-developer questions, see http://android.stackexchange.com
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A question about how the API returns answers.
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A question about the Stack Exchange API: usage, functioning, guidelines, etc.
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Questions about the built-in API help pages at <https://api.stackexchange.com/docs>.
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Questions about the registration, management, and usage of API keys.
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for questions about the Stack Exchange API version 2.
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For questions relating to version 2.1 of the Stack Exchange API.
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For questions relating to version 2.2 of the Stack Exchange API.
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Applications that use the Stack Exchange API are listed as questions and tagged with this tag. The body of the question contains details and screenshots of the application.
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Questions about whether [app]s with certain functionality exist. Some members of the community may react to these questions by creating those [app]s, should they not exist.
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a Q/A site in the Stack Exchange Network.
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A question about how the API returns user associations.
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A question about the Stack Exchange authentication process and related API methods.
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Indicates you've found an erroneous or unexpected behavior in the Stack Exchange API, or the Stack Exchange HTML or CSS, that needs to be fixed.
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Accompanies [app]s written in, or [library]s meant to be used from, the C# programming language
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Questions about / scripts that mess around with Stack Exchange Chat.
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An [app] that takes the form of an extension to the Google Chrome browser.
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Questions handling comments using the API. Or, posts of Scripts / Apps / Libraries that facilitate dealing with comments on Stack Exchange sites.