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.

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Users may only earn a certain amount of reputation each day, with the exception of reputation coming from accepted answers and bounties.
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Questions also answered by the user asking, easily marked by the shaded user card attached to the answer.
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For questions about linked accounts
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an auto-generated image displaying a user's total reputation and badge counts on one Stack Exchange site or across all of them.
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For questions about the profile picture option, which allows users to upload a custom photo as their avatar. Not for questions about Gravatar.
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For questions about comment @replies, also called pings.
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For questions about fostering a sense of community amongst users of Stack Exchange sites
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light-hearted but hopefully of some additional use beyond mere entertainment.
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Every user's account profile has a section showing the recent reviews, revisions, comments, badges, posts (questions and answers), and accepts.
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the little blurbs that pop up when you hover an element in a web page. They are typically taken from an element's "title" attribute.
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Can the site(s) be used by specified users to achieve specified goals?
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The process by which users can vote a question re-opened if it is closed due to some users seeing it as off-topic or otherwise disallowed by the /faq.
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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.
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Questions about the legal aspects of Stack Exchange sites, such as the terms of service, using content and/or code-snippets, attribution, copyrights, patents, using trademarks, etc.
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A dropdown containing recent reputation, badges, and privileges earned across all Stack Exchange sites
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A request to reopen a closed question, or receive further explanation of why it was closed. If your request is to reopen a closed question, it should be one here on Meta Stack Exchange. If it's on ano…
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For questions about the various RSS feeds provided by Stack Exchange sites.
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For questions about the public or private beta phase of a site's progress through the Area 51 site creation process.
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Friendly comparison chart showing the reputation gains and losses between users on a site
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Times a question has been seen by eyeballs, or a profile has been looked over
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newly supported on Stack Exchange. Use this tag for remaining bugs.
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For questions about the CAPTCHA used on Stack Exchange sites to verify that you're a person and not a spam-bot.
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For questions about how the account merge system works.
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related to those Stack Exchange sites which are currently in beta phase.
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Refers to the second, non-commercial, generation of Stack Exchange sites created through Area 51.
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For questions about specific suggested edits that have already been rejected by the community.
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Questions about the licensing of content on Stack Exchange sites.
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A metric previously shown on user cards on posts which indicated the percentage of questions for which the user has accepted an answer.
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For the suggestion of improvements to the phrasing of text shown to users by the Stack Exchange engine.
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For questions about the reputation graph listed in your profile summary, or the reputation graph available on your Stack Exchange network profile.
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For questions dealing with content in foreign languages.
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Questions may be protected by users with 15,000 reputation or by diamond moderators. Protected questions can only be answered by users with at least 10 reputation (110 if they have the association bon…
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For questions concerning various error messages that users receive throughout the network.
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For questions involving the "Ignored Tags" specified in a user's Preferences. Questions with these tags are dimmed or removed entirely from question lists.
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For questions concerning Google, a popular search engine and the main referrer to Stack Exchange sites. For Google as an OpenID provider, use the [google-openid] tag. For questions about Chrome, use t…
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The Stack Exchange button, also known as the Stack Exchange™ MultiCollider SuperDropdown™, refers to the button that appears at the top right of all Stack Exchange 2.0 sites.