Moreover, there's the specter of embedded computers. Not every computer comes in a box and sits on your desktop. Some are tiny chips that sit in places you normally don't think of. Your digital watch has an embedded computer that tells time and, possibly, records phone numbers and acts as a stopwatch. Your car has chips that calculate such things as the car's fuel mixture and the outside temperature in Fahrenheit and Celsius.
Office buildings have computers that decide when to turn on the heat or where to send an elevator.
In fact, an estimated 25 billion to 50 billion embedded computers are currently at work in the United States. No one, really. In the olden days, computer memory was prohibitively expensive. So it was cheaper to process a year as two digits rather than four digits. But as time marched on, consumers demanded that new software be compatible with old software.