Google Hangouts, an app that allowed both chat and video calls from within the Gmail interface, has now been split into two separate apps —Meet and Chat— to better focus on and extend those two functionalities.
Meet
Meet replaces Classic Hangouts video calls.
Supported platforms:
Chrome and Firefox web browsers
Android, iOS, Chrome devices for Meetings
Meet Highlights:
Dial-in phone number and dial-out capability
Allow external invitees with one click (invitee does not need a Gmail account).
Join meetings via a web browser, Google calendar, Meeting link URL, Google Chat, from in-meeting invite, etc. For additional information, see Join a Video Meeting.
Chat lets you easily send a text, send a file, share a document from Google Drive, or start a Meet session. Chat is available via a web browser or stand-alone apps for Windows, Mac, Android, and iOS.