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.
"Posts" covers both questions and answers. (And perhaps wiki pages) For example, you may use this tag for apps that help with general editing.
Questions about: throttling, the `backoff` flag, the quotas, or the rate limiting of requests made to the API. API calls are restricted both by per-second rates and by daily quotas.
Questions that relate to interaction with or usage of this site (Stack Apps).
Use if the question applies ONLY to Stack Overflow and not the rest of the Stack Exchange sites. THIS TAG IS RARELY APPROPRIATE, only use it if you are very sure.
For questions relating to version 2.1 of the Stack Exchange API.
For questions related to developing Stack Apps for the Android platform. General Android development questions should go to Stack Overflow; for non-development questions, see Android Enthusiasts Stack…
Indicates that a request (usually a feature request) has been considered, but will not be implemented. Generally speaking, a developer will leave a comment as to why, or the community will come to con…
Accompanies [app]s written in, or [library]s meant to be used from, the C# programming language
StackAuth is the centralized domain used for network-wide authentication to any site in the network.
Badges are awarded to encourage and reward positive community actions within the site.
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.
Apps that provide notifications of things happening.
A question about the /inbox and related Stack Exchange API methods.
For questions related to the voting endpoints of the API, including delete and close votes
Questions about API methods that add or modify content on Stack Exchange sites. These methods must be invoked via HTTP POST.
Questions about the creation, manipulation, and usage of Filters - which were introduced in v2.0 of the API.
if you have a question about the Sort parameter.
Questions about (user)script support, or using the API from userscripts. If you are announcing or posting a userscript, use the "script" tag instead.
For questions about the `site` parameter or the /sites route of the API. Or about dealing with multiple Stack Exchange sites in/with the API.
Accompanies [app]s written in, or [library]s meant to be used from, the Java programming language
Accompanies [app]s written in, or [library]s meant to be used from, the Ruby programming language
Tools that help with the post timeline feature, or issues with the API handling of /timeline routes.
A tip for developers working with the Stack Exchange API.
Questions about using PHP code to interact with Stack Exchange and/or the Stack Exchange API. ... For general PHP questions, post on Stack Overflow instead.
JSON is 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.
Indicates that the issue will be reviewed in the future, or that a change in functionality is being delayed until a future date.
apps, scripts, library or support questions that are used on or relate to the Apple iPhone device in combination with the API or site.
Changes the "style" (look & feel) of a website
for tools/issues about flags or flagging of posts or chat messages. Flags alert about quality issues on content, when the flagger lacks sufficient reputation to deal with the problem dire…
for tools/issues about *either* closed/on-hold questions or about the process of close-voting or flagging questions into the closed (or on-hold) state. Closed questions will not accept a…
Use either for issues with the design of stackapps.com (HTML/CSS/UI) or for scripts that enhance the design (not features) of Stack Exchange sites. ... Use in conjunction with either the [meta] or th…
Deals with Images/pictures that are parts of Stack Exchange posts, usually in conjunction with the editing tag.
For questions on usage of the Stack Exchange API within the .NET context.
A question about how the API returns user associations.
For apps and scripts which add additional functionality to the review queues, or make it available outside web browsers.
For solutions that work on or with the Windows Phone platform