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There are about 3800 questions using background, where the tag is used for different purposes, such as background music, a background process, the background of an HTML page, the background of an application, an application running in the background, a background service.
Is the tag really helpful? Should be replaced with other tags, or should it be simply burninated?
Replace it where it can be replaced. After that, it could be burninated, which means Stack Exchange staff can removed the tag from the question revisions, and it would be as if the tag has never been used.
Oh, the tag should definitely be burninated, but in the process, the tag should be replaced (or new tags generated where appropriate) with something more specific.