K is for Keyboard Shortcut
Before the development of the GUI (Graphical User Interface) and the
accompanying mouse, the only way to communicate with your computer
was by its keyboard.
Microsoft, who continue to dominate the pc market with their Windows
operating system and their Office suite of software, were actually
latecomers into the world of the GUI. Others, in particular Apple,
were there first.
Often those who had cut their teeth on Microsoft's nerdy
MS-DOS operating system with its inscrutable command-line interface
were sceptical of the mouse and menu GUI. But it soon conquered the
world (of computing).
Nontheless, keyboard-for-command operations did not disappear but
survived as keystroke shortcuts.
So today there are often three ways of instructing your pc
to do something. One, use the mouse to choose a menu from the menu
bar. Two, right click on the screen and choose from a contextual pop-up
menu. And, three, use a keyboard combination. Old hands usually know
them off by heart. Newbies have to look in the help files or in the
menus where the combination is given at the right-hand end of the menu