Chatbots vs LLM ais like chatgpt

Can someone explain to me the difference between how chat bots like Poly.ai and Character.ai operate versus LLMs like chatgpt? Are these bots meant to just agree with you like chat gpt or act more like a real person? What are the differences and how are they structured differently to perform what they do? And how accurately do they mimick human expression and scenarios?

Im curious how this all works to trick the human into feeling the way they do about these AIs.

.