What is chat with Gemini in Google Messages?

Could you please explain what exactly is meant by "chat with Gemini in Google Messages"? Is it a specific feature or service that allows users to communicate directly with Gemini, a cryptocurrency exchange, through the Google Messages app? If so, how does it work? What kind of conversations or inquiries can be initiated through this chat function? Additionally, are there any security measures in place to ensure the safety and privacy of user information during these chats?