A virtual personal assistant developed by Google.
Google Assistant is an AI-powered voice assistant that runs on the Raspberry Pi and x86 platforms and interact via the DialogFlow integration with Home-Assistant. You can also use Google Actions to extend its functionality.
You can simply say "Ok Google" following by your command, and Google Assistant will answer your request.
If you want to integrate your Google Home or mobile phone running Google Assistant, with Home Assistant, then you want the Google Assistant integration.