When you visit the Google’s chatbot bard’s website in Microsoft Bing. A New Button pops up besides the search bar which lets you compare bard results with Bing chat’s. I have no idea why they implemented this, well maybe to show off the their chatbot is better than bard or something?
I’d like to recommend this video by a retired Microsoft OS engineer about how LLMs like ChatGPT and Bard work. It has lots of technical mumbo jumbo, but Dave tries to explain it in simpler terms.