For posterity: Google Talk (often called GChat) became Hangouts. Hangouts is being deprecated. A separate app named Hangouts Chat was released and has been r

For posterity: Google Talk (often called GChat) became Hangouts. Hangouts is being deprecated. A separate app named Hangouts Chat was released and has been renamed to Google Chat. Google Chat and Hangouts share message history, but are otherwise separate. Google Messages (previously Android Messages) is the Google-supplied SMS/MMS/RCS app for Android.