If category and topic tags are the subjects that content is related to, then queries are the tags that describe what the content is about. Adding Query tags to your content is basically specifying under what search queries your content should be found under. For example, a video about a how to make pasta carbonara, would probably be tagged to categories and topics such as: "Food", "Pasta", "Recipes", etc., but it could also be tagged to queries as: "Easy pasta recipes", "How to make pasta carbonara", "DIY home pasta recipes", and many more.
Traditional SEO vs. PUBLC
In the traditional model of SEO in order for content creators to try to target specific search queries they need to incorporate those keywords in the text, trying to add the most important keywords in the content's title.
We believe the current SEO model in traditional search engines is restricting the creators as it forces them to write the content to match the search queries they want to target rather than focusing on the creativity and the experience for the users.
PUBLC changes all that by enabling the creators to write their content as they prefer and tag their content to the queries under which it should be found. This also enables creators to conceive more creative ways of having users find their content that weren't possible in regular search engine's SEO by adding query tags on PUBLC that might describe their content perfectly, but aren't necessarily fitting to be added in the text of the content as is needed in the traditional SEO model.