Most of word-processing or picture-processing machines, online or offline, do their work by controlling electrons, very small bits whose moves make electric current. Those machines are electronic machines. We send out mails, or notes and letters, out of our machines eletronically, and get mails from our friends all over the earth. Years back, the name of those electronic mails became short ones like "e-mails" or "emails." Now boys and girls say those online letters are only "mails."