What is the best electronic application till date? mobile, computer or anything else.

YOU CAN SAY SOFTWARE SENSORS , ROBOTIC PROGRAMED AUTOMOTIVE EQUIPMENTS AS ELECTRONIC APPLICATION.
  AS WELL AS ELECTRONIC DEVICE IS CONCERNED THEY CAN BE ARTIFICIAL HEART, LIVING CLONE MAKERS ETC.

i pad

I think Smartphones, because we can use it all the time as cell phone or computer ( laptop).