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A tag is a keyword or label that categorizes your question with other, similar questions. When you choose to create a new tag, you're asking a question in a topic that nobody before you (on this site, at least) ever has.
Most common tags already exist on a mature site. You should always favor existing tags; only create new tags when you feel you can make a strong case that your questiondoes cover a new topic that nobody else has asked about before on this site.
Simply enter a new tag with your question and it will be created. When creating your new tag, bear in mind that tags ...
a-z0-9+#-.The new tag will now be available for all other community members to use, without needing the new tag privilege. It will also show up in themoderator tools new tag report.
However, note that:
Please create new tags responsibly!
Add new tags to the site