image boards like danbooru and similar websites are an example of the things mentioned by the parent comment. and from my personal experience they are the best

image boards like danbooru and similar websites are an example of the things mentioned by the parent comment. and from my personal experience they are the best implementation of tags I've seen on the internet. they are not perfect and still have lot of room to improve on but they are way better than what's used and available elsewhere. they have their own description, their get moderated, other people can add tags, they can report them, you can alias tags, see related tags, and get feedback on them. disclaimer: most of these image board are NSFW.