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.
For questions about apps, scripts or libraries that specifically target the Apple Mac operating system
Markdown is a lightweight, plain-text, markup language. It is used across the entire Stack Exchange network for post formatting (Questions, answers, wikis, chat) and comment formatting.
For *either* meta questions about Stack Apps, or about how per-site metas are exposed by the API. (Stack Apps is its own meta site)
For BUG REPORTS, not feature-requests. Use this when the API doesn't return data when the docs (or similar calls) say it should. This tag may be eliminated in the future.
to help differentiate moderation questions from the usual Stack Apps post.
Questions about Stack Exchange notifications and the API routes that provide them. Not about apps that provide notifications - use [notifier] instead.
Apps that provide notifications of things happening.
For questions relating to authenticating with the Stack Exchange API using OAuth 2.0, which is an open standard for authorization. General OAuth 2.0 questions are off-topic but might find a home elsew…
For questions about using the Stack Exchange API with the Objective-C programming language. General questions about Objective-C are off-topic but might be asked on Stack Overflow.
Apps, Scripts, Libraries, Bugs, Feature-requests, or APIs that are: deprecated, no longer available/supported, or no longer relevant.
For questions about apps, scripts and libraries that make offline use of Stack Exchange content possible.
For questions related to the use of paging (returning a limited number of results, and using a page parameter to get the next batch) in the Stack Exchange API.
for question about the use of parameters when calling the Stack Exchange API
Perl is a high-level, general-purpose, interpreted, dynamic programming language.
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.
For apps that don't quite work yet, but need a registered Stack Apps post for WRITE ACCESS. If you're following a tutorial which asks to post a placeholder app here to obtain WRITE ACCESS, that's fine…
"Posts" covers both questions and answers. (And perhaps wiki pages) For example, you may use this tag for apps that help with general editing.
Accompanies [app]s written in, or [library]s meant to be used from, the Python programming language
Tools that help with questions, or issues with the API handling of questions.
For questions about the maximum number of API calls per day, AKA 'quota'; 300 for unregistered apps, and 10000 for registered apps (per user when using personalized access tokens, per app otherwise).
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 about displaying things with minimal latency, or apps that do so.
For the feature of registering your app / script / library to get a key and/or use OAuth authentication.
For questions about the aspects of related questions, tags or site.