Google released Bard on 21. March 2023. The latest stable release was released on 15. May 2023. It is still not available in my country (Germany), but it is available in English, Japanese and Korean. You can check for your country on https://bard.google.com
The Best resources about background and history can be found on https://en.wikipedia.org/wiki/Bard_(chatbot). I will try to update this post, when Bard is released in Germany, so I can test it.
