What is Gemini chat?

Could you please elaborate on what exactly Gemini chat is? Is it a specific messaging platform or a feature within the Gemini cryptocurrency exchange? If it's a messaging platform, how does it differ from other similar services? And if it's a feature within Gemini, what kind of communication options does it offer to users? Is it secure and private? Additionally, what are the benefits of using Gemini chat over other communication channels?