A Google email service introduced in 2015 that grouped messages with similar content. Features such as Smart Reply (canned responses) and Smart Compose (filling out the rest of the sentence) were introduced and later added into G Suite's Gmail. Inbox by Gmail was highly praised by many but also criticized by users who felt they were giving up too much control. In 2018, Google announced its end of life in March 2019. See Gmail
and G Suite
If any one of these suggested replies displayed at the end of the incoming message seems fitting, one click enters the text in the reply area.