What is the ice app used for?

Could you possibly explain to me what the purpose of the "ice app" is? I've heard a bit about it, but I'm not entirely clear on its functionalities and how it's being utilized. Is it primarily for communication? Or does it have additional features that make it stand out? Additionally, who are the typical users of this app, and in what scenarios would they find it most beneficial? I'm quite intrigued and looking to gain a deeper understanding. Thank you for taking the time to answer my questions.