When Gmail was released to the community, it was a game changer because unlike ALL the other email systems where you could ONLY drop/transfer an email into a folder to organize it, what Google has done was allow for any number of labels (or tags) to be added to an email. Suddenly, you had the most amazing ability to categorize and organize emails in a really powerful and flexible way.
StackOverflow has also created a pretty amazing tagging system which allows them to categorize Q&A efficiently.
Personally and at work, we manage hundreds of thousands of files, some large and some small. It would be amazing if we could "label" (or "tag") our files in order to categorize them. This would allow for a very powerful search capability.
I work for a startup doing deep learning where we have thousands of frames (images) for training and videos for inference. As of right now, we have a big mess of files on Dropbox. We are considering buying a NAS internally and buying software to organize our files. Only because Dropbox does not suppor such label/tag functionality!
A few typical use cases could be:
If I upload a file, say xyz.jpg to Dropbox, it could automatically create two 'system' tags, entitled 'image' and 'jpeg'. But for me to have the capability of going in and adding tag such as: '720p', 'frame' and 'choke-point', etc. would be really powerful.
For our inference videos, we could classify them such as: 'h264', 'video', 'truck', 'trailer', 'driver', 'xyz-company', etc. This would allow us to easily search the right files and videos we want based on the labels/tags.