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.
the service used by Stack Exchange to handle uploading pictures.
Anything related to posts of low quality, such as flagging posts for "very low quality", or the low quality posts review task.
The black bar across the top of every Stack Exchange site
is for questions about the Stack Exchange tour that is accessed through the help menu in the top bar.
The Stack Exchange Data Explorer (SEDE) allows you to create and run queries against copies of the databases of popular Stack Exchange sites.
referring to the process of identifying and closing questions that are exact duplicates of another question.
Of and relating to the "side bar", or the bar that runs down the right side of the page on Stack Exchange sites.
The process by which users can vote to undelete and return it to the view of the public.
For requests to have a question or answer undeleted.
When viewing a question, the "Related Questions" block is shown on the right side of the page and provides a system-generated list of questions similar to the current one.
For questions about the CAPTCHA used on Stack Exchange sites to verify that you're a person and not a spam-bot.
the version of your post that is saved before you actually complete and submit the post.
For questions about comment @replies, also called pings.
Users may only earn a certain amount of reputation each day, with the exception of reputation coming from accepted answers and bounties.
The standard editor for Stack Exchange posts, which supports a live preview of Markdown syntax.
You can cast votes on questions, answers, and comments but they are limited per-day. You can only cast 30+10 votes in 24 hours.
Activities such as searching, voting, editing your own posts, or suggesting edits are rate-limited on Stack Exchange sites. These restrictions generally exist to prevent abuse.