Tags are keywords. I put tags on every post to help you find the content you want. Tags may be people (Dominic Raab, say), organisations (The Howard League, PRT), themes (women offenders, homelessness) or specific items (heroin, racial disparity, ROTL). If you’re looking to research a particular issue, they can be invaluable.
The developers of these mental health chatbots do not suggest they are a replacement for person-to-person therapy although there do seem to be some real benefits.