https://www.cnet.com/news/google-brings-hangouts-chat-its-slack-competitor-to-all/

Google's messaging app for groups -- Hangouts Chat -- used to be only for people in the company's early adopter program. But this week, Google is releasing it to any corporate customer who wants to use it.

Hangouts Chat lets co-workers, or any group of people, message each other in dedicated chat rooms. People can also share files, photos and videos. These messages can either be private or shared with various groups.