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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Accompanies [app]s written in, or [library]s meant to be used from, the C# programming language
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Questions about the registration, management, and usage of API keys.
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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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Apps that provide notifications of things happening.
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Accompanies [app]s written in, or [library]s meant to be used from, the Java programming language
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A question about the /inbox and related Stack Exchange API methods.
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Questions about (user)script support, or using the API from userscripts.   If you are announcing or posting a userscript, use the "script" tag instead.
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Questions that relate to interaction with or usage of this site (Stack Apps).
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awarded to encourage and reward positive community actions within the site.
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A tip for developers working with the Stack Exchange API.
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Indicates that the issue will be reviewed in the future, or that a change in functionality is being delayed until a future date.
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a text-based open standard. It is human-readable and used for data interchange between applications. Use this tag for questions related to topics about using JSON.
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Questions about the creation, manipulation, and usage of Filters - which were introduced in v2.0 of the API.
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A question about how the API returns user associations.
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Questions about API methods that add or modify content on Stack Exchange sites. These methods must be invoked via HTTP POST.
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Questions about whether userscripts ([script] tag) with certain functionality exist. Some members of the community may react to these questions by creating those userscripts, should they not exist.
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Changes the "style" (look & feel) of a website
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the most frequently asked and answered questions on Stack Apps.