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 Stack Exchange applications which interact with Twitter. General software development questions about Twitter can be asked on Stack Overflow; end user questions on Web Applications Stack Exchange,…
Applications that run on Linux natively or questions about using the API on the Linux platform.
a Q/A site in the Stack Exchange Network.
For scripts and applications that interact with the Stack Exchange Data Explorer (SEDE).
Use for the Stylus or Stylish browser extensions. These customize the appearance of web-pages that you browse. That is, Stylish lets you "Theme" or "Skin" pages you visit by allowing you to overwr…
Questions about displaying things with minimal latency, or apps that do so.
Locked posts can't be: Edited, Voted on, Commented on, Answered, nor Flagged with most flags. Use this questions with how the API handles such posts, or for tools/apps/scripts that deal with locked p…
can be used for chat-based applications that are designed to help chat room owners with room management functions.
A script designed to run with the extensions Stylus, Stylish, etc. -- to alter the look of a site via CSS. A subset of, but not the same as, the [style] tag.
Pertains to features that require 10K reputation to access (The "Access To Moderator Tools" privilege).
Apps that live in ... um, that thing in whichever corner of your screen, with all the icons in it.
its own meta site. Use this tag to help differentiate moderation questions from the usual Stack Apps post.