The other answers are still far more sophisticated for a commoner to understand. I would rather say Electronics is the branch which largely deals with devices that work at low voltages, voltages which wont give you a shock. Eg. Mobiles(touch any part of a mobile and u feel nothing), same goes with laptops,calculators, robots etc. Even for devices which take input from mains ie 230V supply, internally scale it down to lower levels for processing. For example even when a desktop PC works on 230V supply it is internally lowered down so that even if you touch the motherboard of your PC while its still ON you still wont get a shock(unless there is some earthing problem). Devices which work on higher voltages without scaling it down are electrical devices eg fans, refrigerators, bulbs.