A request for assistance with one of the site's features, or a question where you're expecting a concrete answer, and not discussion. If your question is not reporting a bug, requesting a new feature, or soliciting open discussion, this tag is probably the right one.
This tag is used to request help with the use of one of the Stack Exchange sites' pre-existing features, or for questions where you're expecting a concrete answer rather than discussion.
Please check the FAQ first as your support question may have been covered there already. Note that if your question is already answered in a post tagged faq, per policy, it may be closed as a duplicate.
If not, try searching. You'll want to check different ways of posing your question, to avoid asking a question that has already been asked before.
If all else fails, post your support question.