When were desktop computers invented?
The first desktop computer was some model of the DEC PDP-8 in the middle to late 1960s, the OEM catalog price was roughly $10,000. I do not recall the exact model.
Laptop computers, as we now know them, were invented because the existing computers were not portable enough for people of that time. Before lugable/portable/laptop computers came the desktop,er, computer that is. There is still some discussion on who invented Desktop computer with many names mentioned. You would need to go back in History to the Second World War to work out who invented Mainframe computers but some did and they came before desktop computers.
Desktop computers differ from laptops and notebooks because they are not portable like laptops and notebooks. Desktop computers are usually your personal pc computers with windows and/or apple operating systems. Laptop computers are great as they are portable and can be used anywhere there is wifi service as are notebooks.