Google released the Google assistant app 1 year ago but the Google assistant was exclusive to pixel phones and then it became available on Nexus devices and now it is available on every Android device the size of app is less than 1MB 768 kb to be precise if you say ok Google after downloading and setting this app this application give a pop up on your screen which is actually a chat box in which you can ask anything just by saying your query and it will search that query on google and show you the results and you can also activate bunch of actions like opening any app on your phone activating settings like turning on wifi and Bluetooth or calling someone. Go for it if you own a Android device.