Hangouts integrates previous products such as Google Talk, Google+ Messenger and Hangout video chat services.

Hangouts is a unified messaging service announced by Google at the Google I/O Conference in 2013. The new Hangouts is completely based on cloud technology and will become the main pillar of other Google services.

Search your conversations from Gmail. You can find anything you've said in the past in Hangouts via Gmail on the web. Type " in:chats" in the search bar, then enter a set of keywords, and any matching conversation threads will appear. Hangouts contains a variety of settings to control whether people know information such as your email address and cell phone number and can get in touch with you. In the Hangouts app, click the menu button in the upper left corner. Select Customize invitation settings to make changes. You can choose to allow conversations at any time, allow invitations, or block all content.

The Hangouts chat interface is very simple, so simple that only the conversation list remains, and the list that you don't want to show can be archived, like the concept of "archiving" in Gmail, which only hides and does not show up. If you want to find a contact precisely, you need to search for it, but as long as you remember the keywords, the search is quite fast.